This appears in all ten classes in vanilla Arma 3.
Problems in these parameters:
slingCargoDetachAir[]
vanilla ↓↓↓ slingCargoDetachAir[]= { "slingCargoDetach0", "slingCargoDetach1" }; must be ↓↓↓ slingCargoDetachAir[]= { "slingCargoDetachAir0", "slingCargoDetachAir1" };
slingCargoRopeBreak[]
vanilla ↓↓↓ slingCargoRopeBreak[]= { "slingCargoDetach0", "slingCargoDetach1" }; must be ↓↓↓ slingCargoRopeBreak[]= { "slingCargoRopeBreak0", "slingCargoRopeBreak1" };