Mission terminated because DLC content required

[Jacobs9944 11]

so my friends keep getting this message then gets kicked from the game, I checked and double checked that no DLC content is in the mission. I went through the mission sqm file to make sure no dlc content is in the mission but it still kicks them. any help would be grateful. 

[wogz187 1086]

Check this out,
https://www.mgtrolls.eu/forum/m/12045571/viewthread/31675231-fix-mission-terminated-because-dlc-content-required

Have fun!