Halo Reach Winter Contingency "Players failed to Load Content".?

A Month or Two ago i beated halo reach. I decided to go for the a monument to all your sins achievement when it said "players failed to load content" on the first mission. I checked if oni:sword base would do the same, but it loaded properly. I just got the legendary edition back in february and the disc has no scratches.i also checked if nightfall would fail, but it also loaded perfectly. All of the missions load fully except winter contingency. Is there any way to fix this?