[TYPO3-Solr] Indexing Queue: Failures: Where to see what goes wrong?

[Beta Patch]

Hi Søren,

thanks for your quick reply!

When I said I couldn't find anything in the developer log, I meant the devlog extension.
In fact the only entries in devlog are a lot of info entries from CoolURI.
Do I have to activate the output of solr for typo3 to the devlog extensio in some way?

Best,
beta