After Upgrade 2.1 Missing monitoring data for plugins

Hi guys,
I had a very similar case today (but in a german case)
The solution was to clear everything in “~/local/share/check_mk/checks/”. No worry data will be recreated automatically. Then run cmk -R and check that there is no error.
Here and here you can find similar cases (english).
Maybe this is also helpful for you.

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