Android build service failing


I am trying to create a custom scanner using the Android build service.

It fails with the following error:

Either one of your PNG image assets has invalid format or Build Service encountered this issue: -- If your build does not succeed on a retry, try re-uploading the mentioned image asset.

I am a bit confused by this, as it seems like this is an iOS problem, not an Android one? Also I am not adding any custom pngs, am just relying on the defaults Appgyver supplies.