The module was expected to contain an assembly manifest

Question

I have a project in c  that uses c   library and some dlls  When I run it it works great   The library is Awesomium  contains both c   library and c  wrappers  When I create reference to this project from my ASP NET MVC 4 project I get the following error   Exception Details  System BadImageFormatException  Could not load file or assembly  file    D  Projects Development ProGamers GamingSite bin avcodec-52 dll  or one of its dependencies  The module was expected to contain an assembly manifest   Things I ve tried    Coping the dlls  but it still doesn t work  The file exists   Registering it in the GAC but I ve got the same error there  Make sure using  NET Framework 4 0  and not client profile  2 files with the same dll exe name causing conflict - I dont have it  Change the platform of the solution to AnyCPU Mixed Platforms    Stack Trace    BadImageFormatException  Could not load file or assembly  file    D  Projects Development ProGamers GamingSite bin avcodec-52 dll  or one of its dependencies  The module was expected to contain an assembly manifest      System Reflection RuntimeAssembly  nLoad AssemblyName fileName  String codeBase  Evidence assemblySecurity  RuntimeAssembly locationHint  StackCrawlMark amp  stackMark  IntPtr pPrivHostBinder  Boolean throwOnFileNotFound  Boolean forIntrospection  Boolean suppressSecurityChecks   0    System Reflection RuntimeAssembly nLoad AssemblyName fileName  String codeBase  Evidence assemblySecurity  RuntimeAssembly locationHint  StackCrawlMark amp  stackMark  IntPtr pPrivHostBinder  Boolean throwOnFileNotFound  Boolean forIntrospection  Boolean suppressSecurityChecks   34    System Reflection RuntimeAssembly InternalLoadAssemblyName AssemblyName assemblyRef  Evidence assemblySecurity  RuntimeAssembly reqAssembly  StackCrawlMark amp  stackMark  IntPtr pPrivHostBinder  Boolean throwOnFileNotFound  Boolean forIntrospection  Boolean suppressSecurityChecks   152    System Reflection RuntimeAssembly InternalLoadFrom String assemblyFile  Evidence securityEvidence  Byte   hashValue  AssemblyHashAlgorithm hashAlgorithm  Boolean forIntrospection  Boolean suppressSecurityChecks  StackCrawlMark amp  stackMark   102    System Reflection Assembly LoadFrom String assemblyFile   34    WebActivator ActivationManager Run    190   InvalidOperationException  The pre-application start initialization method Run on type WebActivator ActivationManager threw an exception with the following error message  Could not load file or assembly  file    D  Projects Development ProGamers GamingSite bin avcodec-52 dll  or one of its dependencies  The module was expected to contain an assembly manifest       System Web Compilation BuildManager InvokePreStartInitMethodsCore ICollection 1 methods  Func 1 setHostingEnvironmentCultures   550    System Web Compilation BuildManager InvokePreStartInitMethods ICollection 1 methods   132    System Web Compilation BuildManager CallPreStartInitMethods String preStartInitListPath   90    System Web Compilation BuildManager ExecutePreAppStart    135    System Web Hosting HostingEnvironment Initialize ApplicationManager appManager  IApplicationHost appHost  IConfigMapPathFactory configMapPathFactory  HostingEnvironmentParameters hostingParameters  PolicyLevel policyLevel  Exception appDomainCreationException   516   HttpException  0x80004005   The pre-application start initialization method Run on type WebActivator ActivationManager threw an exception with the following error message  Could not load file or assembly  file    D  Projects Development ProGamers GamingSite bin avcodec-52 dll  or one of its dependencies  The module was expected to contain an assembly manifest       System Web HttpRuntime FirstRequestInit HttpContext context   9850940    System Web HttpRuntime EnsureFirstRequestInit HttpContext context   101    System Web HttpRuntime ProcessRequestInternal HttpWorkerRequest wr   456

User · Answer

BadImageFormatException  in my experience  is almost always to do with x86 versus x64 compiled assemblies   It sounds like your C   assembly is compiled for x86 and you are running on an x64 process   Is that correct   Instead of using AnyCPU Mixed as the platform   Try to manually set it to x86 and see if it will run after that   Hope this helps

User · Answer

I found that  I am using a different InstallUtil from my target  NET Framework  I am building a  NET Framework 4 5  meanwhile the error occured if I am using the  NET Framework 2 0 release  Having use the right InstallUtil for my target  NET Framework  solved this problem

User · Answer

Check if the manifest is a valid xml file  I had the same problem by doing a DOS copy command at the end of the build  and it turns out that for some reason I can not understand  copy  was adding a strange character  -   at the end of the manifest files  The problem was solved by adding   b  switch to force binary copy

User · Answer

I got the error in the following case    A  NET EXE file   1  was referencing another  NET EXE file   2  I was trying to obfuscate EXE  2 with Themida  when running the EXE  1 it was crashing with the error  The module was expected to contain an assembly manifest    I simply avoided the obfuscation and the error is gone  not a real solution  but at least I know what caused it

User · Answer

In my case  I was using InstallUtil exe which was causing an error  To install the  Net Core service in window best way to use sc command    More information here Exe installation throwing error The module was expected to contain an assembly manifest  Net Core

User · Answer

First try to open the file with a decompiler such as ILSpy  your dll might be corrupt  I had this error on an online web site  when I downloaded the dll and tried to open it  it was corrupt  probably some error occurred while uploading it via ftp

User · Answer

I found another strange reason and i thought maybe another developer confused as me  I did run install bat that created to install my service in developer Command Prompt of VS2010 but my service generated in VS2012  it was going to this error and drives me to crazy but i try VS2012 Developer Command Prompt tools and everything gone to be OK  I don t no why but my problem was solved  so you can test it and if anyone know reason of that please share with us  Thanks

[c#] The module was expected to contain an assembly manifest

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