Can somebody help me

[xXH2MAFIAH2Xx]

alright I got halo2 on my hard drive like 1 month ago so I can mod the new maps but now I wake up and decide I will go make a map so I skin the map then put all thease changes like new models and when I go try it out it dosenent work so I now try to play the new maps and the old maps and I cant load them so the problem is I cant load maps no more please someone help.

[SpecOp44]

Try getting a fresh shared.map and a mainmenu.map .