Facer Plus problem

I bought Facer Plus like a month ago and in the meantime i changed my phone and everything worked fine until this morning.
I noticed ad during changing watchface which made me suspicious so i checked my account and saw that Plus is not active. When i click on activation i just get red error in bottom of the screen with

“Billing not ready” message.

Please help me to solve this problem.
Thanks in advance,

I fixed it by reinstalling the app. You can delete topic.