"Could not load file or assembly or one of its dependencies. An attempt was made to load a program with an incorrect format." - asp.net

Question

while debugging in VS, the error will be raised when starting debug in VS.
The error is below:
Could not load file or assembly 'p4dn, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.
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.BadImageFormatException: Could not load file or assembly 'p4dn, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[BadImageFormatException: Could not load file or assembly 'p4dn, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.]
System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0
System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +43
System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +127
System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +142
System.Reflection.Assembly.Load(String assemblyString) +28
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46
[ConfigurationErrorsException: Could not load file or assembly 'p4dn, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.]
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +613
System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +203
System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +105
System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178
System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName) +54
System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) +232
System.Web.Compilation.BuildManager.CompileGlobalAsax() +51
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +337
[HttpException (0x80004005): Could not load file or assembly 'p4dn, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.]
System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +58
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +512
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +729
[HttpException (0x80004005): Could not load file or assembly 'p4dn, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8921851
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +85
System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +259
When i create a C# project which use 'p4dn.dll' there isn't this error coming across.
this is my first ASP project, i also read the similar questions like "http://stackoverflow.com/questions/41449/i-get-a-an-attempt-was-made-to-load-a-program-with-an-incorrect-format-error-o" and "http://stackoverflow.com/questions/1648213/could-not-load-file-or-assembly-xxx-or-one-of-its-dependencies-an-attempt-was". They cannot address my problem.
how can I solve this problem?

Answer 1

There is now a menu option to run the 64bit version of IIS Express.
From Visual Studio menu select Tools -> Options... -> Projects and Solutions -> Web Projects
Click the button for "Use the 64 bit version of IIS Express for web sites and projects"

Answer 2

Go to Respective ==> Site Application Pool ,
Click on ==> Advance Settings
Change value of ==> "Enable 32-Bit Applications" from False to True

Answer 3

I had this same error message trying to run (debug) a 64-bit MVC site using IIS Express 8.0. I verified that all my projects were targetting the x64 Platform.
The problem was occurring because Visual Studio runs the 32-bit version of IIS Express. The only way I could get it to work was to run the 64-bit IIS Express by executing the following command manually.
"C:\Program Files\IIS Express\iisexpress.exe" /config:"U:\IISExpress\config\applicationhost.config" /site:"Imaging.Web" /apppool:"Clr4IntegratedAppPool"
Then in your Visual Studio web project go to Properties, select "Use Custom Web Server", and enter the url to your site.
In order to Debug, go to debug > Attach to Process.. and then select your running IIS Express instance.
The Visual Studio team really should make this an option in the Project Properties.

Answer 4

-create a new IIS pool for your web site
-Enable 32bit for this pool

Answer 5

Localization project on Asp.Net with C#
Project was working fine on Local Machine. After uploading on IIS and Web Server, it did not worked and Could not load file or assembly 'App_global.asax' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded. was coming.
After changing Application Pool to V4.0 from v2.0 on IIS, the error got resolved.