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Cmm lock up

I recently came across an error while running a part on the cmm, the machine stopped in the middle of measuring a cylindrical boss,
no reasoning except for a message that popped up on the screen. It read : Dcc not available: Bhbo 2.5400.
Has anyone ever seen this message before and if so what does it mean. I simply reset the cmm and everything
seems to be back to normal, but i would like to figure out what caused the error. Thanks in advance!