I have upgraded to Umbraco 7.5.13 from 7.1.7 but cannot build the website or update anything using NuGet. I am currently getting the following error messages:

• File GenericProperty.ascx.cs was not found
• 'umbracocontrolsgenericpropertiesgenericpropertyaspx' does not contain a definition for 'FullId' and no extension method 'FullId' accepting a first argument of type 'umbracocontrolsgenericpropertiesgenericpropertyaspx' could be found (are you missing a using directive or an assembly reference?)

In the Umbraco.dll file there is only Umbraco.controls, Umbraco.controls.Images and Umbraco.controls.Tree so it looks like I am missing files.

Can someone please help me out on this. It has taken me a week so far to upgrade and I am getting nowhere fast. Thank you.