Error Could not load type MvcApplication

Question

I am getting the error     Could not load type MvcApplication   when I try to run my website   How to correct it

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I had tested every one of these things and none worked  I then remembered I was running the site through my local instance of IIS and had moved the directory where I was compiling the code to  In other words  my IIS site was setup to look at the old directory which had an issue  Going in IIS and changing the root of the site to my new directory obviously fixed the problem

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In some circumstances  new projects you create are not by default set to build   If you right-click on your solution  choose Properties  and choose the Configuration Properties   Configuration node on the left and ensure your project has a checkmark under the Build column   In normal circumstances I ve found this happens by default   In other circumstances  I happen to have a somewhat complex Web Api   Xamarin Android and iOS   Mvc 5 solution that exhibits this behavior  the checkmark isn t present   This is related to the other answers -- if your web projet s assembly is unavailable  you get this error   But this might be a common scenario  especially since you do in fact compile your solution -- the project just doesn t get built

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This could happen very often if you change your namespace  Return the name of your namespace just like it used to be  and that should make it work

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I was getting the same error and inspite of doing everything mentioned here and elsewhere nothing worked  Turned out that I had copied the source code of global asax cs from a previous version of the project which had a different name  So the namespace Test should have been namespace Test WebUI  A silly mistake of course and am a bit embarrassed to write this  But writing in the hope that a similar error from anyone else may lead him to check this trivial aspect as well

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I was working with Azure Mobile App and that problem was when I added MVC Controller  And if you delete all files from Team Explorer  Undo   you will need to delete bin  obj and Global asax cs from Solution folder

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In my case the problem was that I changed the workspace name and the value apparently is case sensitive

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This happened to me because I added Global asax cs  C  file  to a VB net project so the file didn t get compiled and I had to use a  vb version of the file for it to work and get compiled

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I get this problem everytime i save a file that gets dynamically compiled  ascx  aspx etc   I wait about 8-10 seconds then it goes away  It s hellishly annoying   I thought it was perhaps an IIS Express problem so I tried in the inbuilt dev server and am still receiving it after saving a file  I m running an MVC app  i m also using T4MVC  maybe that is a factor

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I just had this problem with an ASP NET MVC Web API project and none of the solutions did the trick   I managed to solve the problem by rebooting the machine  I did an upgrade to Visual Studio 2013  which didn t require reboot  but that was probably causing the problem

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If you re hosting in IIS express and you open your project in two different locations  then you might see this error   The solution is to go to Project Properties Web Servers and click Create Virtual Directory

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I had the same issue and solved it with below steps   Go to project properties On the  Build  tab  set output path to  bin

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If you changed a namespace make sure to right click and refactor

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I ve seen this many times over the last decade and just had it again  There are many problems that result in the same error   One cause is a renaming of files  If you re working with  cshtml files  check all namespaces within those files and within the Views web config file  For web forms  rename Default aspx  related  cs and designer files are automatically renamed   The codebehind changes but the Inherits line in the markup doesn t  Change it manually  Double check the designer page  Sometimes  VS2005-8   the designer page doesn t reflect a change in the namespace  Haven t seen this in 2010    Another issue is when it all works in VS or on your local PC but not when you deploy  This could be because the deployment environment isn t structured the same  For example  the error occurs if you place your code in a virtual directory under an application folder  but it doesn t occur if you create a new application folder and place all of your files in there  I don t understand this one  as I ve had the new child virtual folder set with the same permissions  or so I think  and  I believe  the application pool should work the same for everything in a given application folder   In my case I ve also had a bin folder with assemblies that are updated from other assemblies on the IIS server  Again  ensuring that these are run in a separate application folder resulted in success   HTH

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This can also happen while running the project in visual studio if your IIS Express has is hosting an old different project using the same port assignment    To fix this  you can change the port assignment for this project or close IIS Express

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I had this frustrating error in development environment in Visual studio  and turned out the reason was quite dumb  In short if you have more than one web projects sites in solution  make sure that the port you are trying to access the website is the same as configured in the Project Properties- Web  In my case  the error was caused because I was using a different port to access the website  in the browser  while the project in solution was assigned another port  To explain a little bit more  I had two website projects in my solution Website1 assigned port 8001 in ISS by Visual-Studio  and Website2 assigned port 8101 in ISS by Visual-Studio   So even though I was building Website1  I was trying to access the website using locahost 8101   Now that I finally realized the problem  I see that  StingyJack s comment addresses the similar issue as well

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The solution for me was to right click on the Mvc project  choose properties and click Create Virtual Directory   A message box popped up saying that the project was mapped to the wrong folder  it showed the folder for a different TFS project  It gave the option to map it back to the correct folder

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What worked for me was restarting Visual Studio   I tried manually rebuilding  performing a clean and rebuild  and deleting the bin folder all of which did not work   My output path was already set to bin

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Extracted from question   If you are getting this error   Could not load type MvcApplication   look at the Output path of your project and make sure it is set to  bin    The problem is that the AspNetCompiler cannot find the files if they are not in the default location   Another side effect of changing the output folder is that you will not be able to debug your code and it comes up with a message saying that the Assembly info cannot be found

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Delete the contents of the site s bin folder  use file explorer for this   Rebuild

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I had this error again and none of the above worked for me   I had to remove the following node in  csproj file   lt VisualStudio gt      lt  VisualStudio gt    Reloaded VS and it worked   FYI  VS was able to recreate the node and then I recreated the website in IIS  through VS  and it worked perfectly   Hopefully this will help someone

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Could not load type MVCApplication1 MVCApplication  Problem  Web Config might be corrupted because of some updates in the machine  When I compared the web config with server web config then I realized that all the basic configuration were missing like build providers  modules  handlers  namespaces etc   Resolution  Replace the web config from the below location with web config from server from same location  application is running fine in server   C  Windows Microsoft NET Framework v4 0 30319 Config  I have spent more than 10 days  hence I thought it might be helpful for someone

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Tried everything else then I googled the error I was getting about not being able to find nuget exe    I thought  well I dont really need that    Turns out I did  Solution I found  Right click on the Solution and click Enable NuGet Package Restore

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I got this error because my version control had gotten set to ignore my bin folder  Very stupid  but maybe someone else will benefit

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I tried a lot of suggestions but what worked for me was to use the  publish  functionality  in the Build tab  of Visual studio   I simply used the FTP deployment choice to send the bits to my server with my FTP creds   Then I point IIS at the directory   Of course check your app pool for the correct framework

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My problem was that I hadn t built the project yet  oops    Don t know if this really helps anyone  but just make sure you build everything before clicking links

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Ahh this was annoying   Got this error after a power cut and i returned to my project   I tried restarted VS  I tried setting the output path to  bin  I checked my name spaces   But what worked for me was rebuilding the solution   Rebuild Solution

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I ran into this very problem and I see there all kinds of answers but nothing has been accepted  I after a little bit discovered that simply building the website before trying to run solved my problem

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I was getting this error because I was running the project despite some compile time errors  This I didn t notice

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-For me  the fix was to change the output path in the build tab  I changed the output path to bin  and the error went away   -Another fix could be that you have the wrong start up project set

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My solution   Because I created the problem  I had changed the namespace in Global asax cs  You also need to change the Inherits attribute value in the Global asax

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You have to check the action method  whether there is one or more methods when calling the method that overloads argumens or invalid argument  public string test string a  string b       public ActionResult x         test a    test is need two arguments

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Make sure you shouldn t have to open the MVC project like File- Open Web Site use File- Open Project instead

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Just do a manual build on your solution   If you are using local IIS try deleting the website registration in IIS manager and then recreating it manually

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Right click on the project within the solution that is failing  Unload Project Reload Project Build Project Re-build Solution

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Make sure the namespace in your global asax cs matches the namespace of your webapp

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my problem was that I had 2 projects running on same port  Solution was to change ports and recreate a new virtual directory for the new project

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I know there are lots of solutions to this already  but I thought I ll just mention what solved it for me   My configuration was set to Debug   Changing it to Release did the trick for me

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I already had bin  in my build tab  I got global asax from another copy of the project  but that didn t work out   The solution that finally worked for me was to remove the bin  folder and create a new empty folder with the same name

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As dumb as it might sound  tried everything and it did not work and  finally restarted  VS2012 to see it working again

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Check code behind information  provided in global asax  They should correctly point to the class in its code behind   sample global asax    lt    Application Codebehind  Global asax cs  Inherits  MyApplicationNamespace MyMvcApplication  Language  C     gt    sample code behind      namespace MyApplicationNamespace               public class MyMvcApplication   System Web HttpApplication                       protected void Application Start                                  AreaRegistration RegisterAllAreas                     FilterConfig RegisterGlobalFilters  GlobalFilters Filters                    RouteConfig RegisterRoutes  RouteTable Routes                    BundleConfig RegisterBundles  BundleTable Bundles

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I have fallen into this  I have read and tested all the possible solutions that were given before  Checking build path  build  rebuild  clean  restarting IIS and VS2015  reinstall all nuget packages  compiling them one by one  etc      I suddenly remembered that VS keeps some ASP temporary files in system folders    I think I should give it a try  after all  that could get no worse  So I emptied   C  Windows Microsoft NET Framework64 v4 0 30319 Temporary ASP NET Files C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files   And all is working again    Weird that this problem has such different possible solutions

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In my case issue was I renamed class Global to MvcApplication  When renaming it has to be changed on all places  otherwise app is looking for Global class in given namespace

[asp.net-mvc] Error: «Could not load type MvcApplication»

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