//support.apple.com/kb/HT208050

jimpasaab Said:

"///support.apple.com/kb/HT208050: why I'm getting these message"

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The Boot Shell is Misconfigured:

Something has been misconstrued in the boot sell --A preference to stay away from. So, scan your Mac for malware.

Scan your Mac for Malware: 

Use MalwareBytes for Mac --- This is software that searches for malware/adware. So, scan with it and then remove what is found. Once removed, uninstall MalwareBytes for Mac. Then restart the Mac.

Downloads:

1. Malwarebytes Anti-Malware for Mac
2. Malwarebytes Uninstaller