That WAV error in CTA is sort of like a "catch all" error for all kinds of audio issues, so don't expect to get a clear answer on this one; support knows this very well btw, and there's quite a few threads on this forum about it.
What size is your wav file?
CTA has an ongoing quarrel with audio (this is not the only issue) but as a general rule...try to work with the lightest files possible.
Have you tried converting it to MP3?
Hope it helps :) !
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