my TVH runns again!
My history:
Once I have installed TVH without error. I had no other 3rd party tool installed before.
Then I installed extra usb driver, ipkg, davfs and oscam.
Someday I had a problem with TVH, deinstalled and tried to install again >> your error
After resetting firmware and new install TVH installation works again.
http://forum.synology.com/wiki/index.php/How_to_Reset_the_Synology_System
My data on volume1 keeps untouched, but its better to backup before