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.
 oneshot->channel
 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?