Could not load file or assembly 'DotNetOpenAuth.Core

Question

I get the following error when I start my asp net mvc 4 application:

Could not load file or assembly \'DotNetOpenAuth.Core, Version=4.0.0.0, 
Culture=neutral         


        

Answer 1

I had similar problem. It was really strange as the project was running OK a day before.

Removing obj and bin folders from the project folder, cleaning the solution and rebuilding it worked.

Hope that helps.

Answer 2

Just select "Remove additional files at destination" on publish settings. This works for me

Answer 3

Try doing a global solution search (ctrl+shift+f if you haven't changed it) for the value '2780ccd10d57b246'. I'm guessing you'll find it in your web.config.

Answer 4

One more solution option is to have assembly dependency as follows:

<dependentAssembly>
  <assemblyIdentity name="DotNetOpenAuth.AspNet"
                    publicKeyToken="2780ccd10d57b246"
                    culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-4.3.0.0" newVersion="4.3.0.0" />
</dependentAssembly>
<dependentAssembly>
  <assemblyIdentity name="DotNetOpenAuth.Core"
                    publicKeyToken="2780ccd10d57b246"
                    culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-4.3.0.0" newVersion="4.3.0.0" />
</dependentAssembly>

Answer 5

I do not have the reputation to comment but I can verify that I had this exact problem and Jack gave the correct solution for me. I had recently pressed Add Service Reference and it broke the program with the above error message.

Deleting the _bin_deployableAssemblies folder, and your application's bin folder and then clean and rebuild your application made it work again.

Answer 6

For me helped adding to csproj file the following section:

<PropertyGroup>
   <PostSharpHostConfigurationFile>web.config</PostSharpHostConfigurationFile>            
</PropertyGroup>