Invisible Models....

Hello there, I seem to have a problem with Addon, Even Though I tried things such as Verifying my Garry’s Mod, Resubscribe and much more. It just keep showing up as a

Well certainly I did read the Description of the Addon, Including The Comment section such as I do have the MPF v5 Pack plus the HL2 Games Tick even though The Models still remains invisible in my Garry’s Mod which I do really needed badly for a HL2RP Server. A Help would be appreciated, Thank you.