When you configure your vehicle weapon turret and get error like this:
Error: bin\config.bin/CfgVehicles/<addon>/Turrets/mainGunTurret_1/: Turret body mainGunTurret_1 not found while initializing the model pmc\<addon>\<model>.p3d Error: bin\config.bin/CfgVehicles/<addon>/Turrets/mainGunTurret_1/: Turret gun mainGun_1 not found while initializing the model pmc\<addon>\<model>.p3d
Fix: add the mainGunTurret and mainGun selection into your model.cfg file.