DFGUI DropDownList

[sobhanb-eth]

in dropdown directional list I got such and error

MissingComponentException: There is no 'Collider' attached to the "DirectionList - Dropdown List" game object, but a script is trying to access it.
You probably need to add a Collider to the game object "DirectionList - Dropdown List". Or your script needs to check if the component is attached before using it.
UnityEngine.Collider.Internal_Raycast (UnityEngine.Collider col, Ray ray, UnityEngine.RaycastHit& hitInfo, Single maxDistance) (at /Users/builduser/buildslave/unity/build/artifacts/generated/common/modules/Physics/DynamicsBindings.gen.cs:2875)
UnityEngine.Collider.Raycast (Ray ray, UnityEngine.RaycastHit& hitInfo, Single maxDistance) (at /Users/builduser/buildslave/unity/build/artifacts/generated/common/modules/Physics/DynamicsBindings.gen.cs:2883)
dfDropdown.checkForPopupClose () (at Assets/Daikon Forge/DFGUI/Scripts/Controls/dfDropdown.cs:697)

however the collider is there and already attached to it :|
please help