[Help Wanted] IndexOutofRangeException on TextMeshPro

Suddenly, some of my TextMeshPro objects popup this error in the Editor. Those testmeshs are not able to show the text at runtime. I have to recreate them manually in order to solve the problem. It is not the first time it happened and it suddenly came out from nowhere. Is there any know issue and any way for me to fix it quickly? Thanks.

IndexOutOfRangeException: Index was outside the bounds of the array.
(wrapper stelemref) System.Object.virt_stelemref_class(intptr,object)
TMPro.TextMeshProUGUI.Awake () (at Library/PackageCache/com.unity.textmeshpro@2.0.1/Scripts/Runtime/TMPro_UGUI_Private.cs:141)

 

The above message appears to be related to sub mesh objects which were serialized in 2.0.1. These are used whenever fallbacks, sprites or other fonts are used within the same text object.

I would suggest backing up your project and updating to the latest release of the TMP package which is version 2.1.1 which is available via the package manager. A lot has changed in those newer releases so be sure to review the change log and again to have a backup of the project.