An unhandled exception of type System IO FileNotFoundException occurred in Unknown Module

Question

I am developing a c  application and I get the following error at debug runtime      An unhandled exception of type  System IO FileNotFoundException    occurred in Unknown Module       Additional information  Could not load file or assembly    Autodesk Navisworks Timeliner dll  or one of its dependencies  The   specified module could not be found    Autodesk Navisworks Timeliner dll is in the debug folder of the application  I have repaired the  net framework  version 4  but it did not resolve it  Any ideas on how to resolve this issue  Thanks

User · Answer

If you are running on a 64 bit system and trying to load a 32 bit dll you need to compile your application as 32 bit instead of any cpu. If you are not doing this it behaves exactly as you describe.

If that isn't the case use Dependency Walker to verify that the dll has its required dependencies.

User · Answer

For me it was occurring in a  net project and turned out to be something to do with my Visual Studio installation  I downloaded and installed the latest  net core sdk separately and then reinstalled VS and it worked

User · Answer

Add following codesnippet in your cofig file   lt startup useLegacyV2RuntimeActivationPolicy  true  gt      lt supportedRuntime version  v4 0  sku   NETFramework Version v4 0   gt   lt  startup gt

User · Answer

Enable this option in VS  Just My Code option  Tools -  Options -  Debugging -  General -  Enable Just My Code  Managed only

User · Answer

First check - is the working directory the directory that the application is running in    Right-click on your project and select Properties  Click the Debug tab  Confirm that the Working directory is either empty or equal to the bin debug directory    If this isn t the problem  then ask if Autodesk Navisworks Timeliner dll is requiring another DLL which is not there  If Timeliner dll is not a  NET assembly  you can determine the required imports using the command utility DUMPBIN   dumpbin  imports Autodesk Navisworks Timeliner dll   If it is a  NET assembly  there are a number of tools that can check dependencies   Reflector has already been mentioned  and I use JustDecompile from Telerik   Also see this question

User · Answer

What I would do is use this tool and step through where you are getting the exception  http   www reflector net   Read this it will tell you how to create PDB s so you do not have to have all your references setup   http   www cplotts com 2011 01 14 net-reflector-pro-debugging-the-net-framework-source-code   It is a trial and I am not related to redgate at all I just use there software

[c#] An unhandled exception of type 'System.IO.FileNotFoundException' occurred in Unknown Module

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