VIRB Edit Kept Failing to export on MacBook

Export of video failed.

Unknown error occurred during video exporting.

This above message kept showing up when I export a video. The progress of exporting a video never move forward. and the message showed up after about 1 minute starting export. 

I have tried uninstall the app and reinstall it. The problem is still there. On Mac, it seems you can not completely remove all the file of the app. When reinstall the app. it automatically use the folders they used before.

Thanks in advance.