Suddenly getting "verification failed illegal signature" on my own app

I started suddenly getting "verification failed illegal signature" when I run the app I'm currently making.

I have no issues with Pico trying to attack piracy or whatever, but why did my own game get blocked from my own device? I'm literally the only person in the world who has this APK.

I can't continue working on my game until this gets fixed, so I am in quite a hurry to get this resolved.