load 32-bit assembly

...now browsing by tag

 
"Client certificate" "Authenticate WCF Service clientw ith certificate" "Client certificate" "certificate authentication" "certificate service" .Net 1.1 abstract class abstract method allow access attribute Certificate Client certificate Client Certificate Authentication contenttype Elmah Elmah sql objects;Elmah sql logging setup error logging and handling Godaddy sql database publishing http service IIS6 IIS7 javascript closure json.dll local IIS server mail makecert Membership provider method chaining MVC4 Newton.json.dll object oriented oop open new window from aspnet code-behind Publishing sql database to remote site remote access Response.Redirect extension Secure Communication smtp Smtp mail smtp mail winhost mail SSL virtual method WCF WCF Certificate WCF Security Windows 7 winhost wordpress on iis7
 

Fixing error “..an attempt was made to load a program with an incorrect format.”

Tuesday, April 14th, 2015

For a few hours I had been struggling with this error message when I tried to launch a WCF service (MyProductService.svc) from IIS7 hosted site:

Could not load file or assembly 'SomeExistingDotNetAssembly' or one of its dependencies. An attempt was made to load a program with an incorrect format.

The assembly was not built on my 64-bit machine initially so I suspected there must be something to do with that. After many failed internet searches, I decided to search for the detail error message below:

System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +12857578
   System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +503
   System.Web.Configuration.AssemblyInfo.get_AssemblyInternal() +142
   System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +334
   System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded) +148
   System.Web.Compilation.BuildManager.ExecutePreAppStart() +172
   System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +1151

 

And that finally got me to a post from Stackoverflow which had these sacred words in it:

 Bad Image Format Exception usually means you tried to load a x64 Assembly / native DLL into an 32Bit process or vice versa a 32Bit Assembly into an x64 Process.

I felt I was close to hitting the jackpot! Then another user’s comment on IIS Application Pool setting settled the win for me:

 ...go into your IIS 7 manager console, find the application pool your app is running in, right-click on it, go to Advanced Settings, and change the Enable 32-bit Applications setting to true

And that was all it take to clear my error; after that change on the Application Pool, I clicked my “MyProductService.svc” again and now it rendered the wsdl xml nice and clean.

I am so grateful to these folks who shared and spent time to answer questions. So I reminded myself to do the same whenever I could.

Posted in .Net Framework, IIS7, WCF, Web Services | No Responses »
Tags: , ,