Could not create collection templates, resourceId 9

My system is no longer able to run kmail. When I try to launch kmail, I get a pop-up with this message:

The Email program encountered a fatal error and will terminate now.
The error was:
Could not create collection templates, resourceId 9

Then, kmail terminates.

How can I fix this. BTW, I think this started happening after my system’s hard drive became full…

Anyway, thanks in advance.

Mike.