License error on Android

[Ivoryman]

I've been getting the following error while trying to open iReal b(v1.1.5) on my Samsung Galaxy TAB 10.1, since yesterday. It's the first time since I installed this (which was quite a few yrs back) that I got this error from yesterday.

Licensing Error
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Could not verify the license.
Suggestion:
-Check your internet connection.
-Check the status of your order
-Restart device.
-Delete and reinstall the app
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My net connection is active, I also tried restarting my TAB but the same issue. My Android version on the TAB is v3.1.

Please help.