“INVALID FILE NAME: MUST CONTAIN ONLY [a-z0-9_.]“ for sound files in Android Studio

Question

I am creating an Android App that has sound files in the res/raw folder. 50 of them. They are all named s1.mp3, s2.mp3, s3.mp3 etc.

I have done some searches and found that everyone getting this error only gets it because their file has a capital letter in it. Mine doesn't.

The error started by specifically pointing out that s37.mp3 had the incorrect file name. I then moved that file away completely, thinking that it had a bug or something. When I tried to recompile, it said s38.mp3 had the problem. I then moved all files after s36.mp3 away and it then pointed to s12.mp3 as the problem.

So obviously the Android Studio sees a problem with all of the sound files' names. When I look at the navigation bar on the left of the screen, I see that all the sound files have their regular names, but their extensions are in caps (.MP3). Of course this cannot be the problem, right?

Answer 1

I saw your image and you have a file called s30.MP3, remember FILES MUST CONTAIN ONLY [a-z0-9_.]“ -

the file s30.MP3 must be renamed to s30.mp3