ERROR_CONTACTING_SERVER error is reported by Google Play Store app back to Poweramp when Unlocker from Play is installed; it's reported in the following cases:
- Play Store app not loaded (for example, it currently updates itself). Please start Play Store app and wait until it fully loads, then start Poweramp again at least 2 times
- Poweramp is in not licensed/order is incomplete/refunded/cancelled. Please open Your Orders and check if your Poweramp Full Version Unlocker status is "Complete"
- Internet connection is not available/unstable or Play Store app/services are blocked from Internet
- too much requests from apps to Play servers for a license check. Please try again later (in 10 minutes)
- you may need start/wait a second/exit Poweramp 2 times to reload license state