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Cannot verify purchase
The purchase through google in app purchases is successful but after I check if it is active and not null as in the flutter documentation it gives the following error:
W/BillingHelper( 4463): Couldn't find purchase lists, trying to find single data.
D/EGL_emulation( 4463): eglMakeCurrent: 0xddfec540: ver 3 0 (tinfo 0xde092a80)
D/Qonversion( 4463): Thread - main purchaseRequest - success - Response{protocol=h2, code=200, message=, url=https://api.qonversion.io/v1/user/purchase}
E/flutter ( 4463): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: The getter 'isActive' was called on null.
E/flutter ( 4463): Receiver: null
E/flutter ( 4463): Tried calling: isActive
Please help me, this is preventing me from transferring my app to qonversion.