The type or namespace name 'NetSpell' could not be found (are you missing a using directive or an assembly reference?)

Hi Experts,
I am using Visual Studio 2005.  I am trying to compile a Web Application project and getting the error "The type or namespace name 'NetSpell' could not be found (are you missing a using directive or an assembly reference?)"  

FYI this issue is related to my another open case "Missing csproj: https://www.experts-exchange.com/questions/27660841/Missing-csproj.html", please see if you can open this.  In fact this is an existing project with missing project file (or the *.csproj file is missing).  I had to re-create the project file and added all the items into this project.  Now, when I trying to build the project, I am getting the above error.

Please let me know what I need to do in this scenerio.  I am new to DOT.NET world and don't work so often.  Thank you very much in advance.