How To Fix Custom Binary Blocked On A Samsung Galaxy Core Prime?

Every time I try to turn on my Samsung Galaxy Core Prime in the top left corner it says "Custom Binary Blocked by Reactivation Lock. SECURE FAIL: KERNEL." I have no idea why/what this is or how to fix it as I'm not very tech savy and so I really need help lol. Any help/advice will be greatly appreciated, thank you!

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