android - Failure [INSTALL_FAILED_INVALID_APK]

Question

When I click to run a project I just created in Android Studio 0.2.10 and select my Android (connected by USB with debug by USB on) I get this error:

Waiting for device.
Target device: 0123456789ABCDEF
Uploading file
    local path: /Users/Rui/AndroidStudioProjects/FirstAppProject/FirstApp/build/apk/FirstApp-debug-unaligned.apk
    remote path: /data/local/tmp/rui.firstapp
Installing rui.firstapp
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/rui.firstapp"
pkg: /data/local/tmp/rui.firstapp
Failure [INSTALL_FAILED_INVALID_APK]

Any Idea of what it might be?

Answer 1

I was getting this in Android Studio and all I did to fix it was go to "Build" > "Clean Project" and it just worked.