Open Mails with Thunderbird does not work

[Paul Wellner Bou <paul purecodes org>]

Hello,

I am using Beagle with Thunderbird and since this summer as far as I 
know Thunderbird is supposed to open the mails I open from the 
beagle-search frontend.

This is not working. I am using the latest Beagle svn and I have 
installed the thunderbird beagle addon from svn, too.

Beagle says this if I want to open a Mail:
Unable to run : Failed to execute child process "" (No such file or 
directory)

I don't use the thunderbird from debian, I have the original thunderbird 
installed in /opt/thunderbird.

Regards
Paul.

P.S.: And Thunderbird said this: (I don't know in which situation 
exactly these messages appeared, but it did not appear trying to open 
the mail, it appeared reading some mails)

GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/Lucene.Net.Search.TermQuery+TermWeight/command": 
`+' is an invalid character in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PATH+/command": `+' is an invalid character 
in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PATH+/command": `+' is an invalid character 
in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PREFIX+/command": `+' is an invalid 
character in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PATH+/command": `+' is an invalid character 
in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PATH+/command": `+' is an invalid character 
in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PATH+/command": `+' is an invalid character 
in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PREFIX+/command": `+' is an invalid 
character in key/directory names
GConf Error: Bad key or directory name: 
"/desktop/gnome/url-handlers/PATH+/command": `+' is an invalid character 
in key/directory names