[TYPO3-Solr] Initialize Index Queue Error

[raka]

Am 17.04.2012 21:06, schrieb Ingo Renner:
>
> did you update the DB, try initializing the Solr connections?
>

Solr connections are fine.

What exactly do you mean with DB update?
The update on the first extension installation (add tables 
'tx_solr_indexqueue_item' and 'tx_solr_indexqueue_indexing_property')? 
They exist.

I forgot to mention that the strange thing is that I don't get this 
error everytime I try to initialize. Sometimes I get this error, 
sometimes I do not.
For example yesterday I tried and tried and always got this error. Today 
everything is fine.
Can't figure out what the crucial point is.

Raffael