Why can't I install 3rd party apps anymore?

A

AC Question

I can not install 3th party apps anymore

Since a couple of days I cannot install 3th party apps, including some of my own made apps.
After downloading the app to my tablet, en click to install it says scanning and then it goes back to the filemanger.
I am using Android version 6.0.1
I have enough memory left after deleting some apps and the cache.
Can anyone tell met what I can do to solve this problem?
 

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