Android build not installing

My game works fine in editor, but when I build it for android, the file is unreadable by both my android phone and my emulator.

There are no error messages while playing or building the project, but my phone says "There was a problem while parsing the package" when I try to install it. I did recently update from Unity 4 to 5, but this problem only emerged today. However, between now and then, the android build was still facing errors that did not appear in the editor.

I've tried rebuilding numerous times after restarting my computer and reimporting all assets.

Thanks in advance for any help.