Unable to get permission key for view_newsflow after Update

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Hi,
after updating using the internal update system of concrete5 I got the error message "Unable to get permission key for view_newsflow".
I found a couple of mentioning of the error in the forum but I didn't see a simple applicable solution as I do not understand where to apply the solution suggested here:
https://www.concrete5.org/developers/bugs/5.6.0.1/unable-to-get-perm...

Does anybody know how to fix this error or in what file to apply the solution mentioned above?

Best Regards
Miron

 

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