[Enigmail] The revocation certificate could not be created.

[vmuetze at gmx.net]

Ubuntu 7.10
Mozilla-Thunderbird 2.0.0.12
Enigmail 2:0.95.0-ubuntu4 (20070830)

I created a new key pair.

But when I want to create an revocation certificate, a window opens to
locate the place, where to save the certificate. When I confirm that, I get the
message "The revocation certificate could not be created."

The place where I want to save it, is writable.

Does anybody know a solution or where to find more detailed information?

Thanks
HF