diff --git a/ptsl/PTSL_pb2_grpc.py b/ptsl/PTSL_pb2_grpc.py
index f77ce57..a538708 100644
--- a/ptsl/PTSL_pb2_grpc.py
+++ b/ptsl/PTSL_pb2_grpc.py
@@ -17,15 +17,15 @@ def __init__(self, channel):
             channel: A grpc.Channel.
         """
         self.SendGrpcRequest = channel.unary_unary(
-                '/ptsl.PTSL/SendGrpcRequest',
-                request_serializer=PTSL__pb2.Request.SerializeToString,
-                response_deserializer=PTSL__pb2.Response.FromString,
-                )
+            '/ptsl.PTSL/SendGrpcRequest',
+            request_serializer=PTSL__pb2.Request.SerializeToString,
+            response_deserializer=PTSL__pb2.Response.FromString,
+        )
         self.SendGrpcStreamingRequest = channel.unary_stream(
-                '/ptsl.PTSL/SendGrpcStreamingRequest',
-                request_serializer=PTSL__pb2.Request.SerializeToString,
-                response_deserializer=PTSL__pb2.Response.FromString,
-                )
+            '/ptsl.PTSL/SendGrpcStreamingRequest',
+            request_serializer=PTSL__pb2.Request.SerializeToString,
+            response_deserializer=PTSL__pb2.Response.FromString,
+        )
 
 
 class PTSLServicer(object):
@@ -52,23 +52,24 @@ def SendGrpcStreamingRequest(self, request, context):
 
 def add_PTSLServicer_to_server(servicer, server):
     rpc_method_handlers = {
-            'SendGrpcRequest': grpc.unary_unary_rpc_method_handler(
-                    servicer.SendGrpcRequest,
-                    request_deserializer=PTSL__pb2.Request.FromString,
-                    response_serializer=PTSL__pb2.Response.SerializeToString,
-            ),
-            'SendGrpcStreamingRequest': grpc.unary_stream_rpc_method_handler(
-                    servicer.SendGrpcStreamingRequest,
-                    request_deserializer=PTSL__pb2.Request.FromString,
-                    response_serializer=PTSL__pb2.Response.SerializeToString,
-            ),
+        'SendGrpcRequest': grpc.unary_unary_rpc_method_handler(
+            servicer.SendGrpcRequest,
+            request_deserializer=PTSL__pb2.Request.FromString,
+            response_serializer=PTSL__pb2.Response.SerializeToString,
+        ),
+        'SendGrpcStreamingRequest': grpc.unary_stream_rpc_method_handler(
+            servicer.SendGrpcStreamingRequest,
+            request_deserializer=PTSL__pb2.Request.FromString,
+            response_serializer=PTSL__pb2.Response.SerializeToString,
+        ),
     }
     generic_handler = grpc.method_handlers_generic_handler(
-            'ptsl.PTSL', rpc_method_handlers)
+        'ptsl.PTSL', rpc_method_handlers)
     server.add_generic_rpc_handlers((generic_handler,))
 
-
  # This class is part of an EXPERIMENTAL API.
+
+
 class PTSL(object):
     """*
     Service for handling different types of ProTools commands using PTSL Client.
@@ -76,34 +77,34 @@ class PTSL(object):
 
     @staticmethod
     def SendGrpcRequest(request,
-            target,
-            options=(),
-            channel_credentials=None,
-            call_credentials=None,
-            insecure=False,
-            compression=None,
-            wait_for_ready=None,
-            timeout=None,
-            metadata=None):
+                        target,
+                        options=(),
+                        channel_credentials=None,
+                        call_credentials=None,
+                        insecure=False,
+                        compression=None,
+                        wait_for_ready=None,
+                        timeout=None,
+                        metadata=None):
         return grpc.experimental.unary_unary(request, target, '/ptsl.PTSL/SendGrpcRequest',
-            PTSL__pb2.Request.SerializeToString,
-            PTSL__pb2.Response.FromString,
-            options, channel_credentials,
-            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
+                                             PTSL__pb2.Request.SerializeToString,
+                                             PTSL__pb2.Response.FromString,
+                                             options, channel_credentials,
+                                             insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
 
     @staticmethod
     def SendGrpcStreamingRequest(request,
-            target,
-            options=(),
-            channel_credentials=None,
-            call_credentials=None,
-            insecure=False,
-            compression=None,
-            wait_for_ready=None,
-            timeout=None,
-            metadata=None):
+                                 target,
+                                 options=(),
+                                 channel_credentials=None,
+                                 call_credentials=None,
+                                 insecure=False,
+                                 compression=None,
+                                 wait_for_ready=None,
+                                 timeout=None,
+                                 metadata=None):
         return grpc.experimental.unary_stream(request, target, '/ptsl.PTSL/SendGrpcStreamingRequest',
-            PTSL__pb2.Request.SerializeToString,
-            PTSL__pb2.Response.FromString,
-            options, channel_credentials,
-            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
+                                              PTSL__pb2.Request.SerializeToString,
+                                              PTSL__pb2.Response.FromString,
+                                              options, channel_credentials,
+                                              insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
diff --git a/ptsl/client.py b/ptsl/client.py
index 1655b12..f52e37e 100644
--- a/ptsl/client.py
+++ b/ptsl/client.py
@@ -152,12 +152,12 @@ def run(self, operation: Operation) -> None:
         operation.status = response.header.status
 
         if response.header.status == pt.Failed:
-            cleaned_response_error_json = response.response_error_json 
-            #self._response_error_json_cleanup(
-                #response.response_error_json)
-            command_error = json_format.Parse(cleaned_response_error_json,
+            cleaned_response_error_json = response.response_error_json
+            # self._response_error_json_cleanup(
+            # response.response_error_json)
+            command_errors = json_format.Parse(cleaned_response_error_json,
                                               pt.ResponseError())
-            raise CommandError(command_error.errors)
+            raise CommandError(command_errors.errors)
 
         elif response.header.status == pt.Completed:
             self._handle_completed_response(operation, response)
diff --git a/ptsl/errors.py b/ptsl/errors.py
index 7980fef..3e58d60 100644
--- a/ptsl/errors.py
+++ b/ptsl/errors.py
@@ -27,14 +27,14 @@ def is_warning(self) -> bool:
         """
         `True` if command error message is marked as a warning.
         """
-        return self.error_response[0].is_warning
+        return self.error_responses[0].is_warning
 
     @property
     def error_type(self) -> CommandErrorType:
         """
         :class:`ptsl.PTSL_pb2.CommandErrorType` enumeration value.
         """
-        return self.error_response[0].command_error_type
+        return self.error_responses[0].command_error_type
 
     @property
     def error_name(self) -> Optional[str]:
@@ -51,4 +51,4 @@ def message(self) -> str:
         """
         Error message as returned by the client.
         """
-        return self.error_response[0].command_error_message
+        return self.error_responses[0].command_error_message
diff --git a/tests/test_client.py b/tests/test_client.py
index b59239c..1cc00df 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -51,7 +51,6 @@ def assert_get_track_list_called(self):
     def message_to_json(self, message):
         return json_format.MessageToJson(
             message,
-            including_default_value_fields=True,
             preserving_proto_field_name=True)
 
     def SendGrpcRequest(
@@ -83,18 +82,20 @@ def SendGrpcRequest(
         elif request.header.command == pt.Copy:
             status = pt.Failed
             error_body_json = self.message_to_json(
-                pt.CommandError(
+                pt.ResponseError(errors=[pt.CommandError(
                     command_error_type=pt.PT_UnknownError,
                     command_error_message="Test error response",
                     is_warning=False)
-            )
+                ]))
         elif request.header.command == pt.Paste:
             status = pt.Failed
             error_body_json = """
-            {
-            "command_error_type": "PT_CopyOptionCopy",
-            "command_error_message": "Test error message",
-            "is_warning": true
+            { 
+            "errors": [ {
+                "command_error_type": "PT_CopyOptionCopy",
+                "command_error_message": "Test error message",
+                "is_warning": true
+                } ]
             }
             """