[android-developers] error

Can someone help me understand what caused this error:

[2011-03-29 17:50:48 - apidemos] Installing apidemos.apk...
[2011-03-29 17:52:09 - apidemos] Re-installation failed due to
different application signatures.
[2011-03-29 17:52:09 - apidemos] You must perform a full uninstall of
the application. WARNING: This will remove the application data!
[2011-03-29 17:52:09 - apidemos] Please execute 'adb uninstall
com.example.android.apis' in a shell.
[2011-03-29 17:52:09 - apidemos] Launch canceled!

--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en