Hello Eduardo.
Seems you have start pushing audio with HLS disabled in Global/Application settings and enable it later. In this case output HLS has not been created (since it created at moment it receive stream).
You just have to restart pushing Icecast stream, and it should work.
If you would have another questions, please use contact form: https://wmspanel.com/help . We don't like to use forum for discussing particulal issues, only for common questions. At least because you don't want everyone can see you streams URLs and other settings - I think you get it.