Ok so I am coming back to an Android project I haven't messed with in a year and a new install of Unity on a new machine. After getting past a number of other problems, I now have it building to the phone but right after it installs the APK, I get this error: Code (csharp): Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES] I have googled this and people are talking about making sure you have deleted old packages and what not. I have done this and has made no difference. I have also tried creating a new keystore and still no go. At my wit's end at the moment and would appreciate any help. Also I have tried running this: jarsigner -verify -verbose -certs mypackage.apk It says: Code (csharp): jar verified. Warning: This jar contains entries whose certificate chain is not validated. Edit: I just checked some other packages that I made awhile ago and get the same output, and they still install just fine, so I guess that's normal. Thanks in advance for any help!