diff --git a/src/app/WebHandlers.cpp b/src/app/WebHandlers.cpp
index dce06c412..a320927b5 100644
--- a/src/app/WebHandlers.cpp
+++ b/src/app/WebHandlers.cpp
@@ -14,6 +14,7 @@
 
 #include <boost/asio/spawn.hpp>
 #include <boost/beast/http/status.hpp>
+#include <rpcspec/Errors.hpp>
 
 #include <functional>
 #include <memory>
diff --git a/src/etl/LoadBalancer.cpp b/src/etl/LoadBalancer.cpp
index f19bc0788..03b4854f1 100644
--- a/src/etl/LoadBalancer.cpp
+++ b/src/etl/LoadBalancer.cpp
@@ -8,7 +8,6 @@
 #include "etl/NetworkValidatedLedgersInterface.hpp"
 #include "etl/Source.hpp"
 #include "feed/SubscriptionManagerInterface.hpp"
-#include "rpc/Errors.hpp"
 #include "util/Assert.hpp"
 #include "util/CoroutineGroup.hpp"
 #include "util/Profiler.hpp"
@@ -28,6 +27,7 @@
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
 #include <fmt/format.h>
+#include <rpcspec/Errors.hpp>
 
 #include <algorithm>
 #include <chrono>
diff --git a/src/rpc/CredentialHelpers.cpp b/src/rpc/CredentialHelpers.cpp
index 2601cb03e..f89f904f1 100644
--- a/src/rpc/CredentialHelpers.cpp
+++ b/src/rpc/CredentialHelpers.cpp
@@ -1,5 +1,4 @@
 #include "data/BackendInterface.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/common/Types.hpp"
 #include "util/Assert.hpp"
@@ -7,6 +6,7 @@
 #include <boost/asio/spawn.hpp>
 #include <boost/json/array.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/Slice.h>
 #include <xrpl/basics/StringUtilities.h>
 #include <xrpl/basics/base_uint.h>
diff --git a/src/rpc/Factories.cpp b/src/rpc/Factories.cpp
index 6badd0147..22c4aa996 100644
--- a/src/rpc/Factories.cpp
+++ b/src/rpc/Factories.cpp
@@ -1,7 +1,6 @@
 #include "rpc/Factories.hpp"
 
 #include "data/Types.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/common/APIVersion.hpp"
 #include "rpc/common/Types.hpp"
 #include "util/Taggable.hpp"
@@ -13,6 +12,7 @@
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 
 #include <expected>
 #include <functional>
diff --git a/src/rpc/RPCHelpers.cpp b/src/rpc/RPCHelpers.cpp
index 9b3600588..4158b6358 100644
--- a/src/rpc/RPCHelpers.cpp
+++ b/src/rpc/RPCHelpers.cpp
@@ -4,7 +4,6 @@
 #include "data/AmendmentCenterInterface.hpp"
 #include "data/BackendInterface.hpp"
 #include "data/Types.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/common/Types.hpp"
 #include "util/AccountUtils.hpp"
@@ -27,6 +26,7 @@
 #include <boost/lexical_cast.hpp>
 #include <boost/lexical_cast/bad_lexical_cast.hpp>
 #include <fmt/format.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/Slice.h>
 #include <xrpl/basics/StringUtilities.h>
 #include <xrpl/basics/base_uint.h>
diff --git a/src/rpc/common/MetaProcessors.cpp b/src/rpc/common/MetaProcessors.cpp
index a5ab8cc7c..6b6155d25 100644
--- a/src/rpc/common/MetaProcessors.cpp
+++ b/src/rpc/common/MetaProcessors.cpp
@@ -1,9 +1,9 @@
 #include "rpc/common/MetaProcessors.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/common/Types.hpp"
 
 #include <boost/json/value.hpp>
+#include <rpcspec/Errors.hpp>
 
 #include <string_view>
 
diff --git a/src/rpc/common/Specs.cpp b/src/rpc/common/Specs.cpp
index c837efead..ab0919265 100644
--- a/src/rpc/common/Specs.cpp
+++ b/src/rpc/common/Specs.cpp
@@ -1,11 +1,11 @@
 #include "rpc/common/Specs.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/common/Checkers.hpp"
 #include "rpc/common/Types.hpp"
 
 #include <boost/json/array.hpp>
 #include <boost/json/value.hpp>
+#include <rpcspec/Errors.hpp>
 
 #include <string>
 #include <unordered_map>
diff --git a/src/rpc/common/Validators.cpp b/src/rpc/common/Validators.cpp
index 9be9275a3..d2e1015fd 100644
--- a/src/rpc/common/Validators.cpp
+++ b/src/rpc/common/Validators.cpp
@@ -1,6 +1,5 @@
 #include "rpc/common/Validators.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
 #include "util/AccountUtils.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
 #include <fmt/format.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/StringUtilities.h>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/protocol/AccountID.h>
diff --git a/src/rpc/handlers/AMMInfo.cpp b/src/rpc/handlers/AMMInfo.cpp
index 3eb8f3002..685c253c3 100644
--- a/src/rpc/handlers/AMMInfo.cpp
+++ b/src/rpc/handlers/AMMInfo.cpp
@@ -2,7 +2,6 @@
 
 #include "data/DBHelpers.hpp"
 #include "rpc/AMMHelpers.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/MetaProcessors.hpp"
@@ -18,6 +17,7 @@
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
 #include <date/date.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/chrono.h>
 #include <xrpl/basics/strHex.h>
diff --git a/src/rpc/handlers/AccountChannels.cpp b/src/rpc/handlers/AccountChannels.cpp
index c977be248..9a2ae4e09 100644
--- a/src/rpc/handlers/AccountChannels.cpp
+++ b/src/rpc/handlers/AccountChannels.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountChannels.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
diff --git a/src/rpc/handlers/AccountCurrencies.cpp b/src/rpc/handlers/AccountCurrencies.cpp
index beceda730..a72ebc3e9 100644
--- a/src/rpc/handlers/AccountCurrencies.cpp
+++ b/src/rpc/handlers/AccountCurrencies.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountCurrencies.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -10,6 +9,7 @@
 #include <boost/json/conversion.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/Issue.h>
diff --git a/src/rpc/handlers/AccountInfo.cpp b/src/rpc/handlers/AccountInfo.cpp
index 16d02f484..0112a6448 100644
--- a/src/rpc/handlers/AccountInfo.cpp
+++ b/src/rpc/handlers/AccountInfo.cpp
@@ -1,7 +1,6 @@
 #include "rpc/handlers/AccountInfo.hpp"
 
 #include "data/AmendmentCenter.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/JsonBool.hpp"
@@ -14,6 +13,7 @@
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/ledger/helpers/AccountRootHelpers.h>
 #include <xrpl/protocol/ErrorCodes.h>
diff --git a/src/rpc/handlers/AccountLines.cpp b/src/rpc/handlers/AccountLines.cpp
index 8d0bacee6..982d2deef 100644
--- a/src/rpc/handlers/AccountLines.cpp
+++ b/src/rpc/handlers/AccountLines.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountLines.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/src/rpc/handlers/AccountMPTokenIssuances.cpp b/src/rpc/handlers/AccountMPTokenIssuances.cpp
index 5870adf67..e3143a254 100644
--- a/src/rpc/handlers/AccountMPTokenIssuances.cpp
+++ b/src/rpc/handlers/AccountMPTokenIssuances.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountMPTokenIssuances.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/src/rpc/handlers/AccountMPTokens.cpp b/src/rpc/handlers/AccountMPTokens.cpp
index f5381cee2..bede8e56c 100644
--- a/src/rpc/handlers/AccountMPTokens.cpp
+++ b/src/rpc/handlers/AccountMPTokens.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountMPTokens.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -12,6 +11,7 @@
 #include <boost/json/value.hpp>
 #include <boost/json/value_from.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/src/rpc/handlers/AccountNFTs.cpp b/src/rpc/handlers/AccountNFTs.cpp
index 96b7f9582..2e65fc6cb 100644
--- a/src/rpc/handlers/AccountNFTs.cpp
+++ b/src/rpc/handlers/AccountNFTs.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountNFTs.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -10,6 +9,7 @@
 #include <boost/json/conversion.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
diff --git a/src/rpc/handlers/AccountObjects.cpp b/src/rpc/handlers/AccountObjects.cpp
index 183ebd4e1..cdde3372b 100644
--- a/src/rpc/handlers/AccountObjects.cpp
+++ b/src/rpc/handlers/AccountObjects.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountObjects.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -12,6 +11,7 @@
 #include <boost/json/conversion.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/LedgerFormats.h>
diff --git a/src/rpc/handlers/AccountOffers.cpp b/src/rpc/handlers/AccountOffers.cpp
index 09abb815d..c733ead9f 100644
--- a/src/rpc/handlers/AccountOffers.cpp
+++ b/src/rpc/handlers/AccountOffers.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/AccountOffers.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/value.hpp>
 #include <boost/json/value_from.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/src/rpc/handlers/AccountTx.cpp b/src/rpc/handlers/AccountTx.cpp
index f15bfdb60..ec3c71950 100644
--- a/src/rpc/handlers/AccountTx.cpp
+++ b/src/rpc/handlers/AccountTx.cpp
@@ -1,7 +1,6 @@
 #include "rpc/handlers/AccountTx.hpp"
 
 #include "data/Types.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/JsonBool.hpp"
@@ -17,6 +16,7 @@
 #include <boost/json/value.hpp>
 #include <boost/json/value_from.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/chrono.h>
 #include <xrpl/basics/strHex.h>
diff --git a/src/rpc/handlers/DepositAuthorized.cpp b/src/rpc/handlers/DepositAuthorized.cpp
index e07fb503d..5ba93019d 100644
--- a/src/rpc/handlers/DepositAuthorized.cpp
+++ b/src/rpc/handlers/DepositAuthorized.cpp
@@ -1,7 +1,6 @@
 #include "rpc/handlers/DepositAuthorized.hpp"
 
 #include "rpc/CredentialHelpers.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -13,6 +12,7 @@
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/src/rpc/handlers/Feature.cpp b/src/rpc/handlers/Feature.cpp
index f9821e5e9..a0b69c490 100644
--- a/src/rpc/handlers/Feature.cpp
+++ b/src/rpc/handlers/Feature.cpp
@@ -1,7 +1,6 @@
 #include "rpc/handlers/Feature.hpp"
 
 #include "data/Types.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/MetaProcessors.hpp"
@@ -14,6 +13,7 @@
 #include <boost/json/conversion.hpp>
 #include <boost/json/value.hpp>
 #include <boost/json/value_to.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/LedgerHeader.h>
diff --git a/src/rpc/handlers/MPTHolders.cpp b/src/rpc/handlers/MPTHolders.cpp
index 247f7a815..e84181ccd 100644
--- a/src/rpc/handlers/MPTHolders.cpp
+++ b/src/rpc/handlers/MPTHolders.cpp
@@ -1,6 +1,5 @@
 #include "rpc/handlers/MPTHolders.hpp"
 
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/conversion.hpp>
 #include <boost/json/object.hpp>
 #include <boost/json/value.hpp>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/basics/strHex.h>
 #include <xrpl/protocol/AccountID.h>
diff --git a/src/web/ng/impl/ErrorHandling.cpp b/src/web/ng/impl/ErrorHandling.cpp
index d8a964811..55a87a450 100644
--- a/src/web/ng/impl/ErrorHandling.cpp
+++ b/src/web/ng/impl/ErrorHandling.cpp
@@ -9,6 +9,7 @@
 #include <boost/beast/http/status.hpp>
 #include <boost/json/object.hpp>
 #include <fmt/format.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/protocol/jss.h>
 
 #include <optional>
diff --git a/tests/unit/app/WebHandlersTests.cpp b/tests/unit/app/WebHandlersTests.cpp
index cf86f38f4..5377ef479 100644
--- a/tests/unit/app/WebHandlersTests.cpp
+++ b/tests/unit/app/WebHandlersTests.cpp
@@ -1,5 +1,4 @@
 #include "app/WebHandlers.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/WorkQueue.hpp"
 #include "util/AsioContextTestFixture.hpp"
 #include "util/MockLedgerCache.hpp"
@@ -24,6 +23,7 @@
 #include <boost/json/parse.hpp>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 
 #include <memory>
 #include <stdexcept>
diff --git a/tests/unit/rpc/RPCHelpersTests.cpp b/tests/unit/rpc/RPCHelpersTests.cpp
index 779eb3219..91ac7409a 100644
--- a/tests/unit/rpc/RPCHelpersTests.cpp
+++ b/tests/unit/rpc/RPCHelpersTests.cpp
@@ -1,6 +1,5 @@
 #include "data/AmendmentCenter.hpp"
 #include "data/Types.hpp"
-#include "rpc/Errors.hpp"
 #include "rpc/JS.hpp"
 #include "rpc/RPCHelpers.hpp"
 #include "rpc/common/Types.hpp"
diff --git a/tests/unit/rpc/common/CheckersTests.cpp b/tests/unit/rpc/common/CheckersTests.cpp
index 2c34322cb..a9c99d899 100644
--- a/tests/unit/rpc/common/CheckersTests.cpp
+++ b/tests/unit/rpc/common/CheckersTests.cpp
@@ -1,8 +1,8 @@
-#include "rpc/Errors.hpp"
 #include "rpc/common/Checkers.hpp"
 
 #include <boost/json/value.hpp>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 
 #include <string>
 
diff --git a/tests/unit/rpc/handlers/AccountInfoTests.cpp b/tests/unit/rpc/handlers/AccountInfoTests.cpp
index 481e2c705..5f54977cd 100644
--- a/tests/unit/rpc/handlers/AccountInfoTests.cpp
+++ b/tests/unit/rpc/handlers/AccountInfoTests.cpp
@@ -14,6 +14,7 @@
 #include <fmt/format.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/LedgerFormats.h>
diff --git a/tests/unit/rpc/handlers/AccountLinesTests.cpp b/tests/unit/rpc/handlers/AccountLinesTests.cpp
index d473349cf..e9f42ba93 100644
--- a/tests/unit/rpc/handlers/AccountLinesTests.cpp
+++ b/tests/unit/rpc/handlers/AccountLinesTests.cpp
@@ -12,6 +12,7 @@
 #include <fmt/format.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/LedgerFormats.h>
diff --git a/tests/unit/rpc/handlers/LedgerDataTests.cpp b/tests/unit/rpc/handlers/LedgerDataTests.cpp
index 5e3255ee7..3bf7ed676 100644
--- a/tests/unit/rpc/handlers/LedgerDataTests.cpp
+++ b/tests/unit/rpc/handlers/LedgerDataTests.cpp
@@ -12,6 +12,7 @@
 #include <fmt/format.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/protocol/AccountID.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/tests/unit/rpc/handlers/SubscribeTests.cpp b/tests/unit/rpc/handlers/SubscribeTests.cpp
index 28e77e729..83d8af706 100644
--- a/tests/unit/rpc/handlers/SubscribeTests.cpp
+++ b/tests/unit/rpc/handlers/SubscribeTests.cpp
@@ -18,6 +18,7 @@
 #include <fmt/format.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/protocol/AccountID.h>
 #include <xrpl/protocol/Indexes.h>
diff --git a/tests/unit/rpc/handlers/VaultInfoTests.cpp b/tests/unit/rpc/handlers/VaultInfoTests.cpp
index f1fc0afb0..73e9dc580 100644
--- a/tests/unit/rpc/handlers/VaultInfoTests.cpp
+++ b/tests/unit/rpc/handlers/VaultInfoTests.cpp
@@ -12,6 +12,7 @@
 #include <fmt/format.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/LedgerHeader.h>
diff --git a/tests/unit/web/impl/ErrorHandlingTests.cpp b/tests/unit/web/impl/ErrorHandlingTests.cpp
index 6b36c4cee..a89d6f12d 100644
--- a/tests/unit/web/impl/ErrorHandlingTests.cpp
+++ b/tests/unit/web/impl/ErrorHandlingTests.cpp
@@ -1,4 +1,3 @@
-#include "rpc/Errors.hpp"
 #include "util/NameGenerator.hpp"
 #include "util/Taggable.hpp"
 #include "util/config/ConfigDefinition.hpp"
@@ -12,6 +11,7 @@
 #include <boost/json/serialize.hpp>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 
 #include <memory>
 #include <optional>
diff --git a/tests/unit/web/ng/RPCServerHandlerTests.cpp b/tests/unit/web/ng/RPCServerHandlerTests.cpp
index 3a0f9c79a..31486c4b0 100644
--- a/tests/unit/web/ng/RPCServerHandlerTests.cpp
+++ b/tests/unit/web/ng/RPCServerHandlerTests.cpp
@@ -1,4 +1,3 @@
-#include "rpc/Errors.hpp"
 #include "rpc/common/Types.hpp"
 #include "util/AsioContextTestFixture.hpp"
 #include "util/MockBackendTestFixture.hpp"
@@ -25,6 +24,7 @@
 #include <boost/json/parse.hpp>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 
 #include <algorithm>
 #include <cstdint>
diff --git a/tests/unit/web/ng/impl/ErrorHandlingTests.cpp b/tests/unit/web/ng/impl/ErrorHandlingTests.cpp
index f40721c35..2e16147e1 100644
--- a/tests/unit/web/ng/impl/ErrorHandlingTests.cpp
+++ b/tests/unit/web/ng/impl/ErrorHandlingTests.cpp
@@ -1,4 +1,3 @@
-#include "rpc/Errors.hpp"
 #include "util/NameGenerator.hpp"
 #include "web/ng/Request.hpp"
 #include "web/ng/impl/ErrorHandling.hpp"
@@ -11,6 +10,7 @@
 #include <boost/json/parse.hpp>
 #include <boost/json/serialize.hpp>
 #include <gtest/gtest.h>
+#include <rpcspec/Errors.hpp>
 
 #include <optional>
 #include <string>