Can you help me configure my NAS server?

@Teddy welcome to the Rockstor community.

without more details on when this error occurred, I suspect you’re reusing a disk that had another OS/filesystem on it and it has not been properly wiped (including boot sectors, etc.) before being used for Rockstor.

If that’s the case, take a look here:

If that’s not the scenario, can you provide some more information on the version you’re using/installing and what you were doing before this error occurred.