[propbeanie]

That usually means that there is an Objective in the mis file, but that it is not properly linked (such as an Objective needs a MapZone, but the zone was left out of the Objective page). It can also be from building a mis file, and then later accidentally deleting the Objective... in either case, the game cannot find the Objective, but there is a mis file that it found. If you can open the file in the ME, then you'll be able to find the issue rather easily by comparing the Objective page and the first listed Primary Objective with the Language Localization, and looking at the "brief" for the various Objectives, and comparing those to the actual Objectives page. Or just run the "Validate Mission", and see if it give something useful. Sometimes though, the file will not open in the ME, and you'll have to use a text editor to hunt through the file with...