Warning CS0168 The variable 'ex' is declared but never used - Vsual Studio 2019

Ground Control Software Mission Planner
1

Hi, i want to modify interface of mission planner using visual studio 2019
But i got this warning when i open FlightData.cs in Visual Studio 2019, and

Error CS0168 The variable ‘ex’ is declared but never used|MissionPlanner|C:\Users\Cherry\source\repos\MissionPlanner\GCSViews\FlightData.cs|1591|Active|

What should i do?

2

I don’t want to be rude, but really interested; How would you like to modify Mission Planner, a rather complicated C# program, if you cannot understand and solve a warning like this ?

PS: This warning can be safely ignored.