Problem InternetExplorer

Hello,

we have a problem with the plugin in the internet-explorer (Version 11,Windows 7 )
Screenshot: https://www.dropbox.com/s/71ylefjm9kdtyn9/Screenshot%202014-11-06%2015.37.26.png?dl=0

Message:

“The calendar was not able to parse the data your blog returned about the posts. This error is most likely caused by a conflict with another plugin on your blog. The actual parse error was:

JSON.parseIt”

We disabled all plugins but the calender won´t work.
Can you please help us?

Thank you!

regards
Tobias

https://ww.wp.xz.cn/plugins/editorial-calendar/