2012R2 U1 - An unexpected error occurred while the job was running. (ID 104 Details: The parameter is incorrect (0x80070057))

DPM 2012 R2 with U1.

Adding a new protection group of a Clustered SQL instance - one database selected.

Fails immediately upon running synchronisation with consistency check.

No event logs created on either target or source DPM server.

Has anybody got any ideas?

Thanks.