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WCF Service can not find files when deployed

My WCF service has problems finding its dependency's when I deploy it on the webserver. All DLL's are being deployed with the service in the /bin folder.. I have no idea how to fix this..

Here is the error:

  Exception type: ConfigurationErrorsException
    Exception message: Could not load file or assembly 'E3k.Api' or one of its dependencies. An attempt was made to load a program with an incorrect format.
   at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)
   at System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory()
   at System.Web.Configuration.AssemblyInfo.get_AssemblyInternal()
   at System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig)
   at System.Web.Compilation.BuildManager.CallPreStartInitMethods()
   at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)
WCFMicrosoft IIS Web ServerWeb Services

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8/22/2022 - Mon
Aaron Jabamani

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Bob Learned

How is the assembly built?  

Will it be running on a 64-bit server, and built as a 64-bit or Any CPU?
If it is IIS, how is the server application pool configured?

Third Party DLL caused the problem
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