Thunderbird extension: hdr.folder.path is undefined

[Paul Wellner Bou <paul purecodes org>]

Hi,

I am trying to use beagle svn with Thunderbird 3 (the alpha just 
released). The beagle plugin seems to be configured to be compatible. 
But it gives me a lot of errors saying:

An error occurred while indexing. Error description: TypeError: 
hdr.folder.path is undefined

What does this mean? What is "hr.folder.path"?

Best regards
Paul.