Google Play publshing

Hello I have published games in PC, but now trying in Android, need help for some question. When packaking game I add google play developer license key to unreal editor, and I don’t know is packaking settings correct, I have enabled shipping, full rebuild, for distribution and include pak files. packaking works fine but when trying add .APK file to google play developer i get next error message: "Sending failed

You have sent APK file, which error correction is allowed. This feature must be disabled for security reasons before an application can be published to Google Play. Read more about APK files whose error correction is allowed.

You uploaded an APK that is signed in debug mode. APK need to sign a release mode. Further information about the signing."