secure folder and knox

I have tried to install both knox and secure folder. When i open these apps, bunch of services stops working like google, email. Some continously windows keep pop up which is really annoying. The main error i see is (android.acore.process has stopped). These errors keep happening for both apps after opening them. Now the method to solve the problem differs for each of them. For knox i tried to uninstall and restart several times until the error disappeared but for secure folder i did the same method but it never worked. What i did was clearing contact data from settings /apps/contact/clear data. These two apps are Samsung apps, I think there is a major issue going on with it.