Since I added listeners I have error in the code

Hi, I added a listener to put the test case results in a file and now I get 27 errors when I try to run my script, I do proceed and all is working fine but why all the errors??? Any idea what I should do?

What version of Katalon?

It would help also if you showed the listener code.

it seems that it is working now… I don’t know how it was fixed… maybe I had errors in other windows.

thanks anyway