Changed Path from dynamicConfigFile

from extRelPath to extPath, due to this Bug in earliest typo3 release:

http://www.typo3.net/forum/thematik/zeige/thema/115266/?tx_mmforum_pi1[showForm]=0&cHash=e93cf2f19f9c9bbfd70dd597616b779f

Thanks to Julian Hoffman for the Solution.
This works for me.