I'm in the process of upgrading our Umbraco instance in an effort to get it to a recent version of Umbraco 7. I successfully upgraded from 4.7.1.1. to 4.8.1 with everything working fine. My latest upgrade (in a dev environment) to 4.11.10 has caused the Mobile version of our site to stop working.

We have mobile templates for each of our desktop templates named Mobilexxx.master

The version that was working is version is 51Degrees.Mobi 4.0.4.1

The 51Degrees.mobi.config file in the App_Data folder:

<configSections>        
<sectionGroup name="fiftyOne">          
<section name="log" type="FiftyOne.Foundation.Mobile.Configuration.LogSection, FiftyOne.Foundation" requirePermission="false" allowDefinition="Everywhere" restartOnExternalChanges="false" allowExeDefinition="MachineToApplication"/>             
<section name="redirect" type="FiftyOne.Foundation.Mobile.Configuration.RedirectSection, FiftyOne.Foundation" requirePermission="false" allowDefinition="Everywhere" restartOnExternalChanges="false" allowExeDefinition="MachineToApplication"/>           
<section name="detection" type="FiftyOne.Foundation.Mobile.Detection.Configuration.DetectionSection, FiftyOne.Foundation" requirePermission="false" allowDefinition="Everywhere" restartOnExternalChanges="false" allowExeDefinition="MachineToApplication"/>           
<section name="wurfl" type="FiftyOne.Foundation.Mobile.Detection.Wurfl.Configuration.WurflSection, FiftyOne.Foundation" requirePermission="false" allowDefinition="Everywhere" restartOnExternalChanges="false" allowExeDefinition="MachineToApplication"/>         
</sectionGroup>
  </configSections> 
    <fiftyOne>      
<redirect timeout="20" firstRequestOnly="true" mobilePagesRegex="^\w+://m.myfwc.com/">          
    <locations>
    <location name="noredirect" url="">
        <add property="Url" matchExpression="[&amp;|\?]noredirect"/>
    </location>
    <location name="tablet" url="http://m.myfwc.com/{0}" matchExpression="(?&lt;=^\w+://.+/)(.*)">
        <add property="IsTablet" matchExpression="true"/>
        <add property="IsMobile" matchExpression="true"/>
    </location>
    <location name="mobile" url="http://m.myfwc.com/{0}" matchExpression="(?&lt;=^\w+://.+/)(.*)">
        <add property="IsMobile" matchExpression="true"/>
    </location>     
    </locations>        
</redirect>

        <log logFile="~/App_Data/51Degrees.mobi/Log.txt" logLevel="Info"/>      
<detection binaryFilePath="~/App_Data/51Degrees.mobi/51Degrees.mobi-Lite-2012.07.31.dat" />
    <wurfl wurflFilePath="~/App_Data/51Degrees.mobi/wurfl-2.3.2.xml.gz" newDeviceDetail="maximum"  newDevicesURL="" useActualDeviceRoot="false">
      <wurflPatches>
        <add name="browser_definitions" filePath="~/App_Data/51Degrees.mobi/web_browsers_patch.xml" enabled="true"/>
      </wurflPatches>
    </wurfl>    
</fiftyOne>

And here's a switchMobile.cs in the App_Code folder:

using System; using System.IO; using System.Collections.Generic; using System.Linq; using System.Web; using umbraco.BusinessLogic; using umbraco.cms.businesslogic.web; using umbraco.NodeFactory; using umbraco;

namespace Level2.Events {
    public class TEMP_changeTemplateToMobile : ApplicationBase
    {

        public TEMP_changeTemplateToMobile()
        {
            UmbracoDefault.BeforeRequestInit += new UmbracoDefault.RequestInitEventHandler(UmbracoDefault_BeforeRequestInit);
        }
        void UmbracoDefault_BeforeRequestInit(object sender, RequestInitEventArgs e)
        {
            var page = (UmbracoDefault)sender;          var doc = new Document(e.PageId);
                        HttpContext.Current.Trace.Write("changeTemplateToMobile.url",HttpContext.Current.Request.Url.Authority);            if (HttpContext.Current.Request.Url.Authority.StartsWith("m."))
                {
                // check if template exists and if it does, show the mobile
                string mobTemplate = page.MasterPageFile.Insert(page.MasterPageFile.LastIndexOf("/") + 1, "Mobile");
                string mobPath = HttpContext.Current.Server.MapPath(mobTemplate);
                HttpContext.Current.Trace.Write("changeTemplateToMobile.template",page.MasterPageFile);
                HttpContext.Current.Trace.Write("changeTemplateToMobile.new_template",mobTemplate);

                if(File.Exists(mobPath) && doc.getProperty("isMobile").Value.Equals(1))
                {
                    HttpContext.Current.Trace.Write("changeTemplateToMobile.switching","true");
                    page.MasterPageFile = mobTemplate;
                }   
            }
        }
    } }

Since the old version of 51Degrees.mobi didn't work at all, I upgraded 51Degrees.mobi to version 2.1.21.4. I believe I have the 51Degrees.mobi.config set up correctly, but it appears I have to make changes to the switchMobile.cs because I'm getting this error:

Server Error in '/' Application. Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 27:                { 
Line 28:                // check if template exists and if it does, show the mobile 
Line 29:                string mobTemplate = page.MasterPageFile.Insert(page.MasterPageFile.LastIndexOf("/") + 1, "Mobile"); 
Line 30:                string mobPath = HttpContext.Current.Server.MapPath(mobTemplate); 
Line 31:
                HttpContext.Current.Trace.Write("changeTemplateToMobile.template",page.MasterPageFile);


Source File: e:\wwwroot\App_Code\switchMobile.cs    Line: 29

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]    Level2.Events.TEMP_changeTemplateToMobile.UmbracoDefault_BeforeRequestInit(Object sender, RequestInitEventArgs e) in e:\wwwroot\App_Code\switchMobile.cs:29    umbraco.UmbracoDefault.FireBeforeRequestInit(RequestInitEventArgs e)
+22    umbraco.UmbracoDefault.OnPreInit(EventArgs e) +276    System.Web.UI.Page.PerformPreInit() +31    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+335

We had a contractor originally set this up for us. Any thoughts on how to fix?