Hi everyone, I have upgraded my Umbraco 7.15 site to Umbraco 8, but when I try a build, I receive the following error;

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

I completed the upgrade by using the following commands within package manager console (Nuget) ‘Update-Package UmbracoCms’

I selected ‘L’ when asked if I wanted to overwrite the webconfig.

The last message from package manage was Umbraco successfully upgraded to 8.

I have the following within Views > Web.config

<pages pageBaseType="System.Web.Mvc.WebViewPage">
        <namespaces>
            <add namespace="System.Web.Mvc" />
            <add namespace="System.Web.Mvc.Ajax" />
            <add namespace="System.Web.Mvc.Html" />
            <add namespace="System.Web.Routing" />
            <add namespace="Umbraco.Web" />
            <add namespace="Umbraco.Core" />
            <add namespace="Umbraco.Core.Models" />
            <add namespace="Umbraco.Core.Models.PublishedContent" />
            <add namespace="Umbraco.Web.Mvc" />
            <add namespace="Examine" />
            <add namespace="Umbraco.Web.PublishedModels" />
        </namespaces>
    </pages></system.web.webPages.razor><system.web>

Any help much appreciated as I am losing the will to live….