Sometimes log file includes invaluable information that helps me to fix problems of Yet Comic Reader that you are facing.
If I can specify exactly what is the cause of the problem, I can fix it and release the solution.
This is how to extract the log file from your Mac when you have problem with Yet Comic Reader.
1. Start Console.app by spotlight search or launch pad.
2. Start Yet Comic Reader and re-generate the error that you are facing. It might be opening a problematic file or doing specific action.
3. Then on the 'console', select 'All Messages' and 'Yet Comic Reader' from left pane,
And choose 'Edit' > 'Select All' menu like below screen shot.
Save the selected items into text file into the your convenient place by choosing 'File' > 'Save Selection As...'