Maxim DL uses the position of the scope to adjust the guiding parameters. You will get that error message when Maxim DL has lost the connection to the telescope, or the telescope is not reporting a valid position (for example if it's parked)
You can enter the value manually just to get rid of the error, but it's not the root cause of the problem.
Go to Camera Control->Guide->Scope Dec and enter a valid number.
James
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