Improve error message when binding methods (#331)

Co-authored-by: Bas Conijn <[email protected]>

src/protobuf-net.Grpc/Configuration/ServerBinder.Default.cs

@@ -77,7 +77,7 @@ protected virtual bool TryBind<TService, TRequest, TResponse>(ServiceBindContext
             }
             catch (Exception ex)
             {
-                OnError(ex.Message);
+                OnError("When binding method \"{0}\". Message: {1}", [method.Name, ex.Message]);
                 return false;
             }
         }