A screenshot might help people understand your problem better.
alshahriorhasan | 2021-07-14 07:58
I added it, is it helpful?
DinDinDin | 2021-07-14 14:11
Are you trying to export release apk ? If you are release apk then create an key for release. Open JDK (version 8 is required, more recent versions won’t work)
Create key for debug
keytool -keyalg RSA -genkeypair -alias androiddebugkey -keypass android -keystore debug.keystore -storepass android -dname “CN=Android Debug,O=Android,C=US” -validity 9999 -deststoretype pkcs12