I have Sitecore 8.2(update 1) site with WFFM 8.2. When i navigate to the Sample form folder
sitecore/System/Modules/Web Forms for Marketers/Sample form and click on any form then i got error in popup:
Could not load type 'Sitecore.Form.Submit.ISaveAction' from assembly 'Sitecore.Forms.Core, Version=18.104.22.168, Culture=neutral, PublicKeyToken=null'.
I have all latest dll and config files of WFFM 8.2 and this error i have faced after upgrading my Sitecore from 8.1 to 8.2.