Error while publish workflow

We are getting below error while publishing workflow into upper environment.
Could not resolve type because couldnot find one or more of its type argument row:, column:
could not find type in assembly ‘uipath.activities’

However same code published successfully in lower environment.

Please suggest.

Hi, this sounds like it could be an problem with an activity missing. Check to make sure you have all activity packages installed by going to Activity Packages and selecting All in Available