I've inherited (seems a familar theme!) a 6.2.5 site and trying to upgrade to 7.5.11, then get it into Umbraco Cloud. I've got the 6.2.5 site running as a web app locally (thanks to all the posts). Upgraded via NuGet to 7.5.11 and followed the "Upgrading to v7" instructions. Every time I do this I get an IActionHander error when building the site.

"The type or namespace name 'IActionHandler' could not be found (are you missing a using directive or an assembly reference?) " I've CMS as an assembly (which seems to provide this class?)

This is the code that is throwing the error (Line 11)

Line 1: using System;

Line 2: using System.Collections.Generic;

Line 3: using System.Linq;

Line 4: using System.Web;

Line 5: using umbraco;

Line 6: using umbraco.BusinessLogic.Actions;

Line 7: using umbraco.BusinessLogic.console;

Line 8: using umbraco.cms.businesslogic.web;

Line 9: using umbraco.interfaces;

Line 10:
Line 11: public class AutoCreateYearFolder : IActionHandler

Line 12: { Line 13: #region IActionHandler Members

Line 14:
Line 15: public bool Execute(Document documentObject, IAction action)