diff --git a/bdchain/api/error_details.proto b/bdchain/api/error_details.proto
new file mode 100644
index 0000000..030102c
--- /dev/null
+++ b/bdchain/api/error_details.proto
@@ -0,0 +1,28 @@
+syntax = "proto3";
+
+package bdchain.api;
+
+option go_package = "bdchain/api/grpc/common";
+option java_package = "bdchain.api.grpc";
+option java_outer_classname = "CommonProto";
+option java_multiple_files = true;
+
+// InvalidArgument indicates client specified an invalid argument.
+// Note that this differs from FailedPrecondition. It indicates arguments
+// that are problematic regardless of the state of the system
+// (e.g., a malformed file name).
+message InvalidArgument {
+  // A message type used to describe a single invalid field.
+  message FieldViolation {
+    // A path leading to a field in the request body. The value will be a
+    // sequence of dot-separated identifiers that identify a protocol buffer
+    // field. E.g., "field_violations.field" would identify this field.
+    string field = 1;
+
+    // A description of why the request element is bad.
+    string description = 2;
+  }
+
+  // Describes all violations in a client request.
+  repeated FieldViolation field_violations = 1;
+}
diff --git a/gen.bat b/gen.bat
index a0803ba..2c755e1 100644
--- a/gen.bat
+++ b/gen.bat
@@ -10,6 +10,7 @@ where /q %gen% || echo missing %gen% && exit /B
 
 if not exist %dir% mkdir %dir%
 %exe% -I . --go_out=plugins=grpc:%dir% bdchain/api/common.proto
+%exe% -I . --go_out=plugins=grpc:%dir% bdchain/api/error_details.proto
 %exe% -I . --go_out=plugins=grpc:%dir% bdchain/api/tx_ledger.proto
 %exe% -I . --go_out=plugins=grpc:%dir% bdchain/api/ac_chain.proto
 
diff --git a/gen.sh b/gen.sh
index 88bf8ba..3b2356e 100644
--- a/gen.sh
+++ b/gen.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 mkdir -p gen/go
 protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/common.proto
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/error_details.proto
 protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/tx_ledger.proto
 protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/ac_chain.proto
diff --git a/test.md b/test.md
index cdde0a2..31c4654 100644
--- a/test.md
+++ b/test.md
@@ -236,14 +236,13 @@ transaction:
 **Error**
 ```yaml
 code: Code.InvalidArgument
-message: 'Multiple errors in transaction'
+message: 'Multiple invalid arguments'
 details:
-  - code: Code.InvalidArgument
-    message: 'from must not be empty'
-    details:
-  - code: Code.InvalidArgument
-    message: 'to must be a valid 32-byte address'
-    details:
+  - field_violations: (of type InvalidArgument) 
+    - field: 'transaction.from'
+      description: 'from must not be empty'
+    - field: 'transaction.to'
+      description: 'to must be a valid 32-byte address' 
 ```
 
 ---