[High Sierra] Soundflower SUDDENLY doesn't recognize audio at all

High Sierra 10.13.6

recording device: Quicktime Player

I've been using soundflower for screen recording for the past 6 months. Suddenly the recording device just don't recognize or record the internal audio. I've tried uninstalling and reinstalling, and yes I did reboot after uninstalling.

I've been searching about this for the last 6 hours and no one seems to have problem with this or got an answer for this if they had this issue.