True, will do next time
If I had to hazard a guess, and that is all it is without more detailed information on the errors from you, I would say you have not updated to an HCDB version equal or greater to what the scenario download specifies, HCDB-120426. Grab it from http://harpgamer.com...-1980-2015-era/ and unzip it into your HC directory, overwriting the existing files. You will want to have that straightened out before playing for hours because you might have a fishing dhow in place of a CVN if using a database that doesn't have the units the scenario implements.
Thanks, this solved the problem. Thought I had the latest databases (I'm new to this databases stuff), will pay more attention to scenario requirements next time