[Zope] Add ZCTextIndex Error on Zope 2.6.1 stable release

[Chris]

Dear people at Zope.org,

at the moment I work a bit with Zope to get more into it and I have a
problem that seems to be fixed on the beta1 release:
I get an error message when trying to add a ZCTextIndex - the error message
says  "Error Type: LookupError
Error Value: Lexicon "(name of the lexicon here)" not found".

What can I do besides installing the whole beta release or is there a bugfix
available? I tried to copy the folder of ZCTextIndex from the beta release
Folder to the Zope 2.61 one but this did not work (it was worth a try ;) )

Please help!
Thanks in advance, and keep up the good work!

Chris