scheduler does not show access rights

I installed Scheduler in Joomla 2.5.9
When I look on the tab access rights I don’t see any users or groups. I do see this There was error during configuration saving. Last stable configuration restored.
Error report saved to “com_scheduler_log.xml”. All my componentfolders are set to 755
What have I done wrong. There is no com_scheduler_log.xml
Please help me

Welcome to the club, i have the same issue and no answer yet on the forum. Can you try to enable the debug in the administration and see if you get an error message ?

tks !