Chord Crush: instrumental playback not working

Hi, the instrumental play button is not working in chord crush (in train mode with real songs). I click on the song after guessing the right chord progression. And then I can play the song with youtube but I can not play the song in instrumental mode. Also, the play button of the instrumental mode is not a play sign but it is a circle or a zero sign. It doesn’t play.

I am using my Android smartphone.

What should I do to make this work? I am using the premium version of chord crush.

Please see a screenshot attached of the weird cirle play button