after you pull changes from the repository you need to do HG Update to apply those changes to your working copy then you need to rebuild the solution.
I'm running the latest code on this site and our demo site both updated yesterday as well as on my local machine and it is all working fine including rebuilding the index.
your error sounds like mojoPortal.Business.WebHelpers.IndexHelper is not compiled into your mojoPortal.Web.dll as it should be if you have the latest code.