The apk for your currently selected variant (Unknown output) is not signed.

answer re: Error: The apk for your currently selected variant (Unknown output) is not signed. Please specify a signing configuration for this variant (debug)

Aug 8 '21

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This occurred to me too, this might happen because the default signing configuration is modified after upgrading to Gradle 7.0.0. You can fix this without downgrading the Gradle. To do this,

go to File menu > Project Structure Step Reference Image 1

then go to Modules section Step Reference…

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