UI module is not detected when upgrading the project from 2018.2 to 2018.3

Steps to Reproduce:
1. Create a project in 2018.2 using UI components
2. Upgrade the project to 2018.3
3. Open the Scene and Play

Actual Result:
1. UI Items are not rendered
2. Right Click on Heirarchy Window, "UI" Menu Option is missing.

Works with : 2018.2.0b7, 2018.1.0f2
Reproduces on: 2018.3.0a1

Environment:
Windows 10

Stack Trace :
MissingComponentException: There is no 'CanvasRenderer' attached to the "PlatformInfo" game object, but a script is trying to access it.
You probably need to add a CanvasRenderer to the game object "PlatformInfo". Or your script needs to check if the component is attached before using it.
UnityEngine.UI.Graphic.Rebuild (CanvasUpdate update) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Graphic.cs:526)
UnityEngine.UI.CanvasUpdateRegistry.PerformUpdate () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/CanvasUpdateRegistry.cs:198)
UnityEngine.Canvas:SendWillRenderCanvases()