I have been successfully developing with Google AppEngine/Android C2DM stuff for many months now.
Suddenly, after updating with all the latest Android and AppEngine dev SDK's etc., even the Eclipse built in "App Engine Connected Android Project" (from the Google Plugin for Eclipse) gives the following server error when testing the C2DM:
Server Error: Could not initialize class sun.security.pkcs11.SunPKCS11
Any ideas?
Thanks.