Disallows implicit conversions from ‘string’ to ‘Iresource’

I converted from Windows legacy to Windows recently, and some of my activities stop working with above error. I read through the forum and upgraded all of my package to the latest version to which the upgrade sign disappeared from the panel, and I still have the error. Please help.

I have this error same to you, I fixed, you need to update all package first, and then delete the activity error, drag the new activity to your process again.