Scheduler don´t work on MAMP

Hi,
i´m running an intranet on my mac for the local network. I’am using the tool MAMP (mamp.info/de/) for Mysql and PHP.

The installation is working fine, but by clicking on the Plugins -> Scheduler I can´t save anything.

So I also cannot turn the debug mode on…

The Scheduler show me

If I go to the Scheduler page in the frontend there is another Error Message with “loadXML error”.

I tried a lot, but it isn’t working at all.

My Browser show me three Problems :

I also tried other versions, the only one that works are the 1.x so I think it´s maybe really because of the

File.

Thanks for your help!