The specified object was not found in the store., The process failed to get the correct properties.

[eprice]

Upgraded to Catalina and now I can't erase certain emails in Mail. I keep getting the error message: "The specified object was not found in the store., The process failed to get the correct properties." I see a few other messages in the board but the solutions are a bit too techie for me. Any lay persons' solutions without having to code? Thanks