diff --git a/server/protocol.go b/server/protocol.go
index f81bd42..ff5df62 100644
--- a/server/protocol.go
+++ b/server/protocol.go
@@ -11,7 +11,6 @@ import (
 type ErrorCode int
 
 const (
-	E_RUNTIME          ErrorCode = -33000
 	E_PARSE            ErrorCode = -32700
 	E_INVALID_REQ      ErrorCode = -32600
 	E_NOT_FOUND_METHOD ErrorCode = -32601
@@ -63,18 +62,14 @@ func NewGrpcError(err error) *Error {
 	var code ErrorCode
 
 	switch resultStatus.Code() {
-	case grpcCodes.Unknown:
-		code = E_RUNTIME
 	case grpcCodes.InvalidArgument:
 		code = E_INVALID_PARAMS
 	case grpcCodes.Internal:
 		code = E_INTERNAL
 	case grpcCodes.Unimplemented:
 		code = E_NOT_FOUND_METHOD
-	case grpcCodes.Unavailable:
-		code = E_NOT_FOUND_METHOD
 	default:
-
+		code = E_SERVER
 	}
 
 	e := &Error{