Galaxy Note 3 "Prevention Information" error

I've been getting a strange error on my Note 3 lately. It happens about every hour and I don't know why. It says:

"Prevention Information"
"An application has been forced to stop for an unauthorized attempt to access system in your device. It may be safe to delete an application obtained from an unauthorized route. Check now?"

If I click OK then I'm taken to the applications list. Cancel and the message comes back an hour later.

Ideas on what is causing this?

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Next time it happens longpress on the error. It should show which application is causing this.

Others have reported that it is a program called Knox, which is a Samsung security app. It sometimes happens when connecting and disconnecting from a wi-fi network.

Try this to clear the cache partition:

• Turn off the phone and remove the battery, then reinsert
• Press and hold the Volume Up key and Home key, then press and hold the Power key
• When it vibrates release the Power key
• The recovery menu should appear - release the other keys
• Navigate using the Volume keys to Wipe all cache (power key to select)
• Press the Power key to reboot

Thanks, I did this and so far so good!