Short 3 beeps,red purple light blinking up

This is what I get , even after resetting .
error:8
Grbl ‘$’ command cannot be used unless Grbl is IDLE. Ensures smooth operation during a job.
Don’t know now , who can help me ( hardware Ortur lm 3 )

Make a mistake ,it is 3 times purple and 3 beebs , I think system error.

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