Hi! I've seen this problem in many threads in here, but haven't found a solution. So I created a faction based on Project OPFOR's PMC (copied the PMC faction), added some vehicles from RHS USAF, gave them crew, then made some AI groups.

When I try to pack the addons I get this error:

Build failed. Result code=1
CfgConvert task failed.
File D:\Pulpit\@pmcenhanced\addons\i_pmce\autogen.hpp, line 2110: /CfgVehicles/I_PMCE_UG_60M.Turrets: Undefined base class 'Turrets'
Config: some input after EndOfFile.
Error reading config file 'D:\Pulpit\@pmcenhanced\addons\i_pmce\config.cpp'
Class CBA_Extended_Eventhandlers_base destroyed with lock count 23
Class  destroyed with lock count 1

Now, I'm no expert in coding, but I've scrolled up and the class is definitely defined there:

class RHS_UH60M;
    class RHS_UH60M_OCimport_01 : RHS_UH60M { scope = 0; class EventHandlers; class Turrets; };
    class RHS_UH60M_OCimport_02 : RHS_UH60M_OCimport_01 { 
        class EventHandlers; 
        class Turrets : Turrets {
            class CopilotTurret;
            class MainTurret;
            class RightDoorGun;
            class CargoTurret_01;
            class CargoTurret_02;
            class CargoTurret_03;
            class CargoTurret_04;
        };
    };

And here's my added unit, to which the error points:

class I_PMCE_UH_60M : RHS_UH60M {
        author = "MCPO Joe Graves";
        scope = 0;
        scopeCurator = 2;
        displayName = "UH-60M";
        side = 2;
        faction = "I_PMCE";
        crew = "I_PMCE_Pilot_01";

        class Turrets : Turrets {
            class CopilotTurret : CopilotTurret { gunnerType = "I_PMCE_Pilot_01"; };
            class MainTurret : MainTurret { gunnerType = "rhsusf_army_ucp_helicrew"; };
            class RightDoorGun : RightDoorGun { gunnerType = "I_PMCE_Pilot_01"; };
            class CargoTurret_01 : CargoTurret_01 { gunnerType = ""; };
            class CargoTurret_02 : CargoTurret_02 { gunnerType = ""; };
            class CargoTurret_03 : CargoTurret_03 { gunnerType = ""; };
            class CargoTurret_04 : CargoTurret_04 { gunnerType = ""; };
        };



        class EventHandlers : EventHandlers {
            class CBA_Extended_EventHandlers : CBA_Extended_EventHandlers_base {};

            class ALiVE_orbatCreator {
                init = "if (local (_this select 0)) then {_onSpawn = {sleep 0.3; _unit = _this select 0;};_this spawn _onSpawn;(_this select 0) addMPEventHandler ['MPRespawn', _onSpawn];};";
            };

        };

        // custom attributes (do not delete)
        ALiVE_orbatCreator_owned = 1;

    };

The same error appears for any RHSUSAF vehicle I've added, which has firing slots (defined by Turrets class), including those vehicles which are a part of Project OPFOR (based on RHS); ex. Humvees.

So what did I miss?

@EDIT I've just tried to export RHS US Army Desert and it gives the same error! What the hell am I doing wrong?
Also, wiki isn't quite up-to-date, which option should I use - Full Faction or Full Faction (To File) and what's the difference?

I've come to a conclusion it's RHS USAF's problem. If I use any vanilla assets it works fine. If I use AFRF assets it works fine. Now the best part: if I use Project OPFOR's assets like Humvee, which is the same model as RHS's Humvee (even the textures are applicable to both humvees) IT STILL WORKS FINE! But if I use RHS USAF's Humvee it gives me the error. Any workaround for this?