Hi I've just upgraded from 7.4.2 to 7.5.4 via NuGet package manage and everything seemed to go OK. I can access the frontend of the site without any issues but when I try and go to the login screen via /umbraco I get the error

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

Compiler Error Message: CS1061: 'System.Web.Mvc.HtmlHelper<object>' does not contain a definition for 'AngularValueExternalLoginInfoScript' and no extension method 'AngularValueExternalLoginInfoScript' accepting a first argument of type 'System.Web.Mvc.HtmlHelper<object>' could be found (are you missing a using directive or an assembly reference?)

Source Error:


Line 73:         document.angularReady = function(app) {
Line 74: 
Line 75:             @Html.AngularValueExternalLoginInfoScript((IEnumerable<string>)ViewBag.ExternalSignInError)
Line 76:             @Html.AngularValueResetPasswordCodeInfoScript(ViewData["PasswordResetCode"])
Line 77:         }

I've cleaned my solution, rebuilt it and still get the error. Anyone else come across this before?