Security error "unauthorised changes made to your software......."

My Galaxy Grand Prime + is rooted but now I get the above message which prohibits me from getting software updates. I deleted Knox using the "Uninstaller" app from Google Play Store which I thought was the cause of the problem. To my horror the problem still reared it's ugly head. I also don't have Security Log Agent on my phone. What can I do to get rectify it?

I look forward to your reply. Many thanks. Steve

[emoji137]You can’t software update a rooted phone.