Unity 2019.1.0a11 and UIElements error

Thimble2600 · Dec 11, 2018

I like to live my life like every day is my last... which is why I'm extremely cross that for the last few days I've not been able to debug in Visual Studio, and every time I click play in Unity I'm presented with an error that seems completely unrelated to my project and only started showing up since updating to the alpha.

I guess it IS an alpha, so I shouldn't be too upset.

After updating to Unity 2019.1.0a11 when I first encountered these issues I thought this meant my Visual Studio tools for Unity was out of date so I launched the VS installer, removed and reinstalled tools for unity.

I also removed my projects .csproj and .sln files as I read some time ago that doing so somewhat fixes issues with VS.

When I hit play in Unity this error pops up.

InvalidOperationException: UIElements can't run in Experimental and Public mode at the same time. Please update your code to use the UnityEngine.UIElements namespace. Use SwitchUIElementMode() to change namespaces

UnityEditor.GUIView.get_panel () (at C:/buildslave/unity/build/Editor/Mono/GUIView.cs:54)

UnityEditor.GUIView.get_visualTree ()UnityEditor.HostView.UpdatePlayModeColor (Color newColorToUse) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:669)

UnityEditor.HostView.PlayModeStateChangedCallback (PlayModeStateChange state) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:654)

UnityEditor.EditorApplication.Internal_PlayModeStateChanged (PlayModeStateChange state) (at C:/buildslave/unity/build/Editor/Mono/EditorApplication.cs:302)

UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)
Click to expand...

When I try to debug in Visual Studio these errors pop up

Severity Code Description Project File Line Suppression State
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\AutoAlign.cs 2 Active
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MainMenuScript.cs 2 Active
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\Math\InputManager.cs 4 Active
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MinimapScript.cs 3 Active
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MouseOverTileDisplay.cs 2 Active
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\Networking\Client.cs 2 Active
Error CS0234 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\User Interface\UserInterface.cs 3 Active
Error CS0246 The type or namespace name 'Toggle' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\Networking\Client.cs 22 Active
Error CS0246 The type or namespace name 'RawImage' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MainMenuScript.cs 8 Active
Error CS0246 The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\AutoAlign.cs 10 Active
Error CS0246 The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MainMenuScript.cs 14 Active
Error CS0246 The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MinimapScript.cs 12 Active
Error CS0246 The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\MouseOverTileDisplay.cs 9 Active
Error CS0246 The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\User Interface\UserInterface.cs 13 Active
Error CS0246 The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\User Interface\UserInterface.cs 16 Active
Error CS0246 The type or namespace name 'GraphicRaycaster' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\Math\InputManager.cs 28 Active
Error CS0234 The type or namespace name 'EventSystems' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\Math\InputManager.cs 3 Active
Error CS0246 The type or namespace name 'EventSystem' could not be found (are you missing a using directive or an assembly reference?)
Assembly-CSharp C:\Users\Retri\OneDrive\Documents\Unity Projects\Arryatlee\Assets\Scripts\Math\InputManager.cs 31 Active
Click to expand...

I tried reporting this as a bug in Unity but the bug report also threw errors when clicking Send which I thought was hilarious.

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Unity 2019.1.0a11 and UIElements error

Thimble2600