Umbraco.Web.Models.RenderModel' does not contain a definition for 'NodeTypeAlias'

Getting this error with my partial view:

@inherits Umbraco.Web.Mvc.UmbracoViewPage
@using umbraco.MacroEngines

@helper setHeadings(string sectionHeading,string pageHeading,string contentTitle){ }

@functions{
public string getSectionIcon(dynamic node){
string prefix = “”;
dynamic rootNode = Model.AncestorOrSelf();
if(rootNode.HasValue(“mainMenu”)){
foreach(var item in rootNode.mainMenu){
var id = item.link.ToString();
if(id == node.Id.ToString()){
prefix = item.prefix.ToString() + " ";
}
}
}
return prefix;
}
}

@helper eventHeadings(){
@setHeadings(“Event Section”,“Event Heading”,“Event Title”)
}

@helper newsHeadings(){
@setHeadings(“News Section”,“News Heading”,“News Title”)
}

@helper primaryCareHeadings(){
@setHeadings(“Primary Care”,“PC Heading”,“PC Title”)
}

@helper defaultHeadings(){
int level = Model.Level;
string sectionHeading = “”;
string pageHeading = “”;
string contentTitle = “”;
string parentLink;
dynamic parent;

if(Model.Level <= 2){
	//Level 1
	sectionHeading = getSectionIcon(Model) + Model.Title;
}
else {
	//Level 2+
	dynamic sectionNode = Model.AncestorOrSelf(2);
	sectionHeading = getSectionIcon(sectionNode) + " " + sectionNode.Title;
	//sectionHeading = sectionNode.Title;
}

//Just show title for pages at level 2
if(level < 4) {
	//Level 1-3
	pageHeading = Model.HasValue("subheading") ? Model.Subheading : Model.Title;		
}
else {
	//Level 4+
	parent = Model.Parent;
	//Show link to parent and then page title...
	pageHeading = parent.Title;
	contentTitle = Model.Title;
}

@setHeadings(sectionHeading,pageHeading,contentTitle)

}

@{
string nodeType = Model.NodeTypeAlias;

switch (nodeType)
{
	case "event": 
		@eventHeadings()
		break;
	case "news": 
		@newsHeadings()
		break;
    case "primaryCare": 
		@primaryCareHeadings()
		break;
	default:
		@defaultHeadings()
		break;   
}

}


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/40977-umbracowebmodelsrendermodel-does-not-contain-a-definition-for-nodetypealias