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Hi, I'm Mr.med. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
I'm sorry about the issue, This usually happens if there is any problem with RAM, Hard drive or with the system files.
Please try some basic troubleshooting steps to isolate and fix the problem. First try Disk Utility :
Then reset the PRAM and NVRAM of your Mac. Follow the steps below :
Let me know the results