Choreographed scene works when watching normally, but not in sourcerecorder

I recorded a demo of an NPC saying a line (using the NPC Scene tool). This works when playing it normally, but when i try to record it with sourcerecorder the NPC doesn’t do anything, and in the console I got the error “file “thanks for that.mp3” not found in the disk/repository” or something along those lines.

Anyone know how to help?