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;   
    }

}