What is INSTALL_PARSE_FAILED_NO_CERTIFICATES error?

I was trying to change my default/main/startup (whatever you call it) activity by editing the androidmanifest.xml file. All i did was change the android:name property. however, this completely broke the entire app. when I try to install it fails and reads. Installation error: INSTALL_PARSE_FAILED_NO_CERTIFICATES When I tried to change it back to its previous state, … Read more