TYPO3 Core

I have the exact same problem. Both on a version. 6.1.0. and the "old" 6.0.x.
We have two experienced TYPO3 integrators here that agree that everything is set up correct. Still we get the "Error: No Object" message in our crawler log and no indexing of files.

Here is what I think causes the problem:
In file /typo3/sysext/indexed_search/Classes/Indexer, lines 799 and 811, there is this call:

$crawler->addQueueEntry_callBack(0, $params, 'EXT:indexed_search/class.crawler.php:&TYPO3\\CMS\\IndexedSearch\\Controller\\SearchFormController_files', $this->conf['id']);

That Controller named SearchFormController_files does not exist. In the former version it was tx_indexedsearch_files, so I guess there is a typo in the current version.

I exchanged the above lines with…

$crawler->addQueueEntry_callBack(0, $params, 'EXT:indexed_search/class.crawler.php:&tx_indexedsearch_files', $this->conf['id']);

…and now I get an "OK" when I try to index a file.

I have met the same problem with Typo3 6.1.2 and 6.1.1

Everything has been configured super precisely by following step by step Xavier Perseguers tutorial frome here : http://xavier.perseguers.ch/tutoriels/typo3/articles/indexed-search-crawler.html

But I get the error displaying truncated in the crawler log :
Error: No object: EXT:indexed_search/class.crawler...

I could not find the complete error message in my website error log nor into typo3 error log. This makes debugging hard ! The error message should be displayed fully in the crawler log rather than truncated !

I tried to apply Christian's fix with greate expectations, unfortunately it didn't make the trick for me.

Obviously there misses a file SearchFormController_files in the Classes/Controller directory.

Also since Typo3 6.0, the class tx_indexedsearch_files has been renamed to CrawlerFilesHook, so the suggested fix above should now rather read :
$crawler->addQueueEntry_callBack(0, $params, 'EXT:indexed_search/class.crawler.php:&CrawlerFilesHook', $this->conf['id']);

Unfortunately for some reason it doesn't work either on my installation.

This is another thing broken in Typo3 6.0. I have met so many of these while doing my first Typo3 6.0 website. This new version is a real regression, this is a fact, despite of all the generous work done by open source developers. Recoding such important parts of the CMS while Typo3 NEOS is coming behind is a total nonsense and waste of time, while being dramatically bug prone.

So, starting from the begining, how to get the full error message ?

Christian's fix is working for me. Controller named SearchFormController also reside in typo3temp/Cache/Code/cache_core/. So try to empty Cache catalog.

Patch set 1 for branch TYPO3_6-1 has been pushed to the review server.
It is available at https://review.typo3.org/22906

Patch set 1 for branch TYPO3_6-0 has been pushed to the review server.
It is available at https://review.typo3.org/22907

Patch set 2 for branch TYPO3_6-0 has been pushed to the review server.
It is available at https://review.typo3.org/22907

Patch set 2 for branch TYPO3_6-1 has been pushed to the review server.
It is available at https://review.typo3.org/22906