====== ArmA 2 (<class>) Not Found In The List Of Active Addons ======

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(<class>) not found in the list of active addons error in RPT, what causes it?

The reason is that you do not list the new cfgVehicles or cfgWeapon class in units[] and weapons[] in the cfgPatches section in their configs.

This is very important to do for save games, the mission editor saving the correct requiredAddons into the mission.sqm and activateAddons scripting command.