System BadImageFormatException An attempt was made to load a program with an incorrect format

Question

I m writing a plug-in for another program that is based on a public  NET API  Typically these plugins are made by creating a class library DLL that references the API assembly  Then a command class is created by inheriting from a base command class in the API assembly  The application is then set to reference the plug-in DLL file  and is then also responsible for actually firing up the custom command class when the user requests it   However  now I m trying to automate some code generation through System CodeDOM  and want to create a simple console application that automatically generates new Class Types based off of types with in the API assembly   Yet  when I try to run my application I get the following exception      System BadImageFormatException was   unhandled Message  Could not load file   or assembly  RevitAPI    Version 2011 0 0 0  Culture neutral    PublicKeyToken null  or one of its   dependencies  An attempt was made to   load a program with an incorrect   format    Usually I need to set the target framework of a plug-in assembly to 3 5  Yet now I ve found that the error above goes away if I set the target framework of my console application to 2 0  However  my console application already references other class libraries of mine that have their target framework set to 3 5  And I d really rather not rewrite them around the 2 0 framework

User · Answer

If you use IIS  Go to the Application pool Select the one that your site uses and click Advance Settings Make sure that the Enable 32-Bit Applications is set to True

User · Answer

It s possibly a 32 - 64 bits mismatch   If you re running on a 64-bit OS  the Assembly RevitAPI may be compiled as 32-bit and your process as 64-bit or  Any CPU    Or  the RevitAPI is compiled as 64-bit and your process is compiled as 32-bit or  Any CPU  and running on a 32-bit OS

User · Answer

These suggestions are accurate  but I wanted to add a note  I was stuck simply because I had multiple publishing configurations  I was editing the  Debug - Any CPU  and then deploying the  Debug - x64  configuration  Make sure you are editing and deploying the same configuration  Verify this by clicking the  Settings  tab after you begin publishing and the  Publish Web  dialog pops up  Make sure it matches the configuration you edited   That s 4 hours of my life I will never get back

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I was having problems with a new install of VS with an x64 project - for Visual Studio 2013  Visual Studio 2015 and Visual Studio 2017   Tools   - gt  Options    - gt  Projects and Solutions     - gt  Web Projects      - gt  Check  Use the 64 bit version of IIS Express for web sites and projects

User · Answer

i have same problem what i did i just downloaded 32-bit dll and added it to my bin folder this is solved my problem

User · Answer

For running it on any CPU either 62 bit or 32 bit follow these steps  Right click on the name of the project in Solution Explorer gt  Properties gt Build and have these under Configuration  Active Release   Platform Active Any CPU  and Target x86  and just beside the Run button Select option Release and Any CPU from the options  And then Save it and Run

User · Answer

I had the same issue when getting my software running on another machine  On my developer pc  Windows 7   I had Visual Studio 2015 installed  the target pc was a clean installation of Windows 10   Net installed   I also tested it on another clean Windows 7 pc including  Net Framework  However  on both target pc s I needed to install the Visual C   Redistributable for Visual Studio 2015 package for x86 or x64  depends on what your application is build for   That was already installed on my developer pc   My application was using a C library  which has been compiled to a C   application using  clr and  TP options in visual studio  Also the application was providing functions to C  by using dllexport method signatures  Not sure if the C  integration leaded to give me that error or if a C   application would have given me the same   Hope it helps anybody

[.net] System.BadImageFormatException An attempt was made to load a program with an incorrect format

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