INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES on adb install

Question

The same Android project is built in debug mode, sometimes with Eclipse, sometimes with ant (on build machine).

If I first install the ant build, and then try to start Eclipse debugging, the Eclipse console displays

[2012-03-20 13:32:26 - myproject] Re-installation failed due to different application signatures. [2012-03-20 13:32:26 - myproject] You must perform a full uninstall of the application. WARNING: This will remove the application data!
[2012-03-20 13:32:26 - myproject] Please execute 'adb uninstall com.myproject' in a shell. [2012-03-20 13:32:26 - myproject] Launch canceled!

If I do this the other way around, i.e., debug with Eclipse (includes installing the apk) and then try to install the ant build from command line, I get:

Failure [INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES]

What is wrong with my certificates/signing?

Answer 1

For me the problem was I had the same application already installed with another key. Uninstalling the old application solved the problem, as noted here:

https://stackoverflow.com/a/10280878