App not installed (on android)


I have written a simple test app that displays the text “test” in a textview. The app works in the emulator on the same android version.

On my android device it will not install saying “app not installed” after attempted installation.

I have already allowed unknown apps to be installed, and allowed “my files” as a trusted source. I have turned off play protect and restarted.

Does anyone know a possible solution?