Please can you tell me what you were doing before the crash? What was playing, a song, break note, URL etc? You have somehow got the software into an unrecoverable state. I have received the error report you have submitted and I will see if it is trivial to resolve and release a fix.
If you do not have much data to lose, you can delete the program data by going to C:\ProgramData\ and deleting (or renaming) the PlayIt Live folder.
I was manually loading a playlist and suddenly the program crashed and I got the attached screenshot. I tried again and got the same thing. I rebooted and got the same thing and finally uninstalled and reinstalled and it still won't start.