diff --git a/src/common/jsonrpc2/server.py b/src/common/jsonrpc2/server.py
index 765727e..f16b9ae 100644
--- a/src/common/jsonrpc2/server.py
+++ b/src/common/jsonrpc2/server.py
@@ -33,18 +33,18 @@ class Request[T]:
         varnames = handler.__code__.co_varnames
 
         if self.params is None:
-            if argcount > 0: raise self.ParamsError()
+            if argcount > 0: raise self.ParamsError(None)
             return handler()
 
         if isinstance(args, list):
-            if len(args) != argcount: raise self.ParamsError()
+            if len(args) != argcount: raise self.ParamsError(args)
             return handler(*args)
 
         if isinstance(args, dict):
-            if args.keys() != set(varnames): raise self.ParamsError()
+            if args.keys() != set(varnames): raise self.ParamsError(args)
             return handler(**args)
 
-        raise TypeError()
+        raise TypeError(repr(args))
 
 class Response[T]:
     def __init__(self, id: str|int, inner: T):
@@ -60,23 +60,24 @@ class Response[T]:
             data['result'] = self.inner
         return json.dumps(data)
 
-class Error(Enum):
-    PARSE_ERROR = -32700
-    INVALID_REQUEST = -32600
-    METHOD_NOT_FOUND = -32601
-    INVALID_PARAMS = -32602
-    INTERNAL_ERROR = -32603
+class Error:
+    def __init__(self, code, data=None):
+        self.code: Error.Code = code
+        self.data = data
 
-    def __init__(self, *args):
-        super().__init__(*args)
-        self.data = None
+    class Code(Enum):
+        PARSE_ERROR = -32700
+        INVALID_REQUEST = -32600
+        METHOD_NOT_FOUND = -32601
+        INVALID_PARAMS = -32602
+        INTERNAL_ERROR = -32603
 
     def message(self) -> str:
-        return self.name.capitalize().replace('_', ' ')
+        return self.code.name.capitalize().replace('_', ' ')
 
     def response(self):
         result = dict()
-        result['code'] = self.value
+        result['code'] = self.code.value
         result['message'] = self.message()
         if self.data is not None:
             result['data'] = self.data
@@ -123,23 +124,23 @@ async def handler(request: ws.WebSocketRequest):
             mid = inbound.id
             res = inbound.fulfill()
         except json.decoder.JSONDecodeError as e:
-            err = Error.PARSE_ERROR
+            err = Error(Error.Code.PARSE_ERROR)
             exc = e
         except Request.ParamsError as e:
-            err = Error.INVALID_PARAMS
+            err = Error(Error.Code.INVALID_PARAMS)
             exc = e
         except TypeError as e:
-            err = Error.INVALID_REQUEST
+            err = Error(Error.Code.INVALID_REQUEST)
             exc = e
         except KeyError as e:
-            err = Error.METHOD_NOT_FOUND
+            err = Error(Error.Code.METHOD_NOT_FOUND)
             err.data = str(e).strip("'")
             exc = e
         except ws.ConnectionClosed as e:
             logger.critical('Going away', exc_info=e)
             return
         except Exception as e:
-            err = Error.INTERNAL_ERROR
+            err = Error(Error.Code.INTERNAL_ERROR)
             exc = e
         
         if err is not None: logger.error(err.message(), exc_info=exc)