MP3 and WAVs suddenly corrupt

I was working on my game, changing some things, but then in the build there was no music and errors spammed the console.
Things like:

result == FMOD_OK
An invalid object handle was used.
The file 'myFile' does not contain a supported 'wav' format (This command failed because System::init or System::setDriver was not called.)

All the .WAV and .MP3 files I made now have the deafult File icon and “Unity failed to import this file. Try to reimport.”
Reimporting does nothing.
What’s happening?

Another way to go is have the mp3 files play directly and not convert them.

I maid an Asset to do this just, it works on Win, Max, Linux, iOS, android…

Asset - uAudio: Mp3 Player/Streamer