Text mesh pro not working after update

I was make a zombie fps game on unity 2017.4.0 and used Text Mesh pro for UI.Then unity asked for update for unity 2018.2 so I gave update and all my UI stopped working and it showed errors.

I have the same problem. Here’s my error:

/Users/Office/Library/Unity/cache/packages/packages.unity.com/com.unity.textmeshpro@1.2.4/Scripts/Runtime/TMPro_Private.cs(3551,92): error CS0121: The call is ambiguous between the following methods or properties: TMPro.TMPro_ExtensionMethods.Compare(this UnityEngine.Color32, UnityEngine.Color32)' and TMPro.TMPro_ExtensionMethods.Compare(this UnityEngine.Color32, UnityEngine.Color32)’