How to release game to Google Play

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I've created a game in Godot, and I'm trying to upload it to Google Play to release in a few days. I made sure the app wasn't in debug mode and I created an upload key with android studio. When I go to upload the game, however, Google presents me with this:

You uploaded an APK with an invalid signature (learn more about signing). 
Error from apksigner: ERROR: JAR_SIG_NO_MANIFEST: Missing META-INF/MANIFEST.MF

I've looked everywhere on here, reddit, youtube, stack overflow, etc. but nothing has helped me solve the issue.

1) What does the error mean and
2) How do I fix it?
Thanks

in Engine by (12 points)

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