Unsupported G code error

Everything worked great yesterday. turned the machine on today and I get this no matter what I try to run.Target buffer size found
File imported in 6 milliseconds
Starting stream
Layer C00
Unsupported or invalid g-code command found in block.
On or near line 0:
Job halted
Stream completed in 0:00


Could be an incorrect GRBL device type; generally you want plain old GRBL:

Perhaps G-Code clustering is enabled in the Device Settings for a GRBL controller that does not support it. Make sure that option is turned Off.

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