[VB][Resolved]function 'SetMapping' doesn't return a value on all code paths

Error message

function 'SetMapping' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used

Source :

Function SetMapping()
    Console.WriteLine("do sth")
End Function

If you make sure there is nothing to return, change the keyword Function to Sub

Sub SetMapping()
    Console.WriteLine("do sth")
End Sub

Reference:
https://stackoverflow.com/questions/52126716/function-start-doesnt-return-a-value-on-all-code-paths-a-null-reference-except