Improved error message in case of parameter count mismatch in JSONRPC APIs

Author: danieleteti

sources/MVCFramework.JSONRPC.pas

@@ -1840,7 +1840,7 @@ function TMVCJSONRPCController.InvokeMethod(const fRPCInstance: TObject;
 
     if Assigned(lJSONNamedParams) and (lParamsCountMinusInjectedOnes <> lJSONNamedParams.Count) then
       raise EMVCJSONRPCInvalidParams.CreateFmt('Wrong parameters count. Expected [%d] got [%d].',
-        [lParamsCount, lJSONNamedParams.Count]);
+        [lParamsCountMinusInjectedOnes, lJSONNamedParams.Count]);
   end
   else
   begin