Standart Assets ERROR since the Update 2018.2.1f1

Assets/Standard Assets/Utility/AlphaButtonClickMask.cs(5,52): error CS1070: The type `UnityEngine.ICanvasRaycastFilter’ has been forwarded to an assembly that is not referenced. Enable the built-in package ‘UI’ in the Package Manager window to fix this error.

How to fix that problem???
I don’t understand :frowning:

@devsanson
@RockStar_360

Here Just copy and paste the code below and your package manifest which is located

C:\Users\Public\Documents\Unity Projects\Project\Packages

{
“dependencies”: {
“com.unity.ads”: “2.0.8”,
“com.unity.analytics”: “2.0.16”,
“com.unity.package-manager-ui”: “1.9.11”,
“com.unity.purchasing”: “2.0.3”,
“com.unity.textmeshpro”: “1.2.4”,
“com.unity.modules.ai”: “1.0.0”,
“com.unity.modules.animation”: “1.0.0”,
“com.unity.modules.assetbundle”: “1.0.0”,
“com.unity.modules.audio”: “1.0.0”,
“com.unity.modules.cloth”: “1.0.0”,
“com.unity.modules.director”: “1.0.0”,
“com.unity.modules.imageconversion”: “1.0.0”,
“com.unity.modules.imgui”: “1.0.0”,
“com.unity.modules.jsonserialize”: “1.0.0”,
“com.unity.modules.particlesystem”: “1.0.0”,
“com.unity.modules.physics”: “1.0.0”,
“com.unity.modules.physics2d”: “1.0.0”,
“com.unity.modules.screencapture”: “1.0.0”,
“com.unity.modules.terrain”: “1.0.0”,
“com.unity.modules.terrainphysics”: “1.0.0”,
“com.unity.modules.tilemap”: “1.0.0”,
“com.unity.modules.ui”: “1.0.0”,
“com.unity.modules.uielements”: “1.0.0”,
“com.unity.modules.umbra”: “1.0.0”,
“com.unity.modules.unityanalytics”: “1.0.0”,
“com.unity.modules.unitywebrequest”: “1.0.0”,
“com.unity.modules.unitywebrequestassetbundle”: “1.0.0”,
“com.unity.modules.unitywebrequestaudio”: “1.0.0”,
“com.unity.modules.unitywebrequesttexture”: “1.0.0”,
“com.unity.modules.unitywebrequestwww”: “1.0.0”,
“com.unity.modules.vehicles”: “1.0.0”,
“com.unity.modules.video”: “1.0.0”,
“com.unity.modules.vr”: “1.0.0”,
“com.unity.modules.wind”: “1.0.0”,
“com.unity.modules.xr”: “1.0.0”
}
}

I have the same error since the update. Anyone?

please
folder does not exist C:\Users\Public\Documents\Unity Projects\Project\Packages

my folder
C:\Users\Public\Documents