PKGBackup: crash when selecting "backup". HELP PLEASE! :(

I've installed PKGBackup since it's compatible with iOS 8. My version is 8.1.1. I've the problem that I want to update to 8.2, jailbreak with TaiG and install my old tweaks from the backup. Now, when I press the orange "backup" button, the entire app crashes! :( please help, I'm stuck