TMPro error CS0246: The type or namespace name 'TMPro' could not be found (are you missing a using directive or an assembly reference?) Fails over time

I downloaded the Creator kit RPG. It works for a while. If i let Unity stay open and close my computer.
Next day the TMpro has failed and gives one of several errors.
"error CS0246: The type or namespace name ‘TMPro’ could not be found (are you missing a using directive or an assembly reference?)
"
Unity complains that i need to fix those errors before continues.

Download TextMeshPro asset:
https://assetstore.unity.com/packages/essentials/beta-projects/textmesh-pro-84126