Error in Installation failed due to invalid APK file on the android Simulator

When running an android project, the simulator always displays [17:10:10-bus1] Installation failed due to invalid APK file! [17:10:10-bus1] Please check logcat output for more details. [
17:10:10-bus1] Launch canceled! However, it works normally when other android projects are running. I searched for some solutions on the Internet, such as restarting eclipse, deleting a virtual machine, re-creating a virtual machine, and restarting the computer .... I didn't know what the error was. I tried it accidentally and it was okay. The simulator started normally.

1. In properties-> JAVA bulid path-> source, delete the gen directory;

2. Delete the automatically generated Gen directory;

3. re-build.