`UnityEngine.HoloLens' has already been imported (Unity 5.5f2)

I’m getting this error when I switched to 5.5f2 on the cloud build

[Unity] error CS1704: An assembly with the same name `UnityEngine.HoloLens’ has already been imported. Consider removing one of the references or sign the assembly
[Unity] /UNITY_PATH/Unity/Unity-5_5_0f2/Unity.app/Contents/UnityExtensions/Unity/UnityHoloLens/Runtime/UnityEngine.HoloLens.dll (Location of the symbol related to previous error)
[Unity] /UNITY_PATH/Unity/Unity-5_5_0f2/Unity.app/Contents/UnityExtensions/Unity/UnityHoloLens/RuntimeEditor/UnityEngine.HoloLens.dll (Location of the symbol related to previous error)

any ideas? for both android/ios builds, thanks

Did you happen to check a HoloLens.dll into your repo? If not, maybe try using 5.5.0f3 now that it is released.

hmm dont think so but i did check in the library folder which I probably shouldnt have. removed them from the repo and its fine now thanks!