Could not load file or assembly 'System, Versi

Question

I have this exception generated on some user machines (~1 of 20):

Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

I found several references to this error over the web and this site but nothing helped.

I have an add-in application which uses WCF to connect to the server. The add-in built with .NET Framework 3.5 with VS 2008.

The error is reproducible on one of the test machines in only one user account. I install my application and can only reproduce this from one account on this machine everywhere else it is working fine. Furthermore it is only reproducible with only one version of host application which I created add-in for (I assume because it uses differnet .NET Frameworks).

I have checked the fuse logs and I see the following:

---

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework64\v2.0.50727\mscorwks.dll
Running under executable  C:\Program Files\SolidWorks Corp\SolidWorks\sldworks.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: User = Home\User
LOG: DisplayName = System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
 (Fully-specified)
LOG: Appbase = file:///C:/Program Files/SolidWorks Corp/SolidWorks/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = NULL
Calling assembly : System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.

---

So by some reasons it is trying to use v2.0.50727\mscorwks.dll loader to load the Version=4.0.0.0 of System.dll. On build machine I'm referring 2.0.0.0 version of System.dll

Any help is much appreciated.

Thanks, Artem

Answer 1

I answered too late but it has worked in my case.If you are facing this issue in your project please add the following line in your web.config :

<compilation  batch="false" >

This worked in my case. If you already have compilation tag in your web.config then add only batch="false" property to it.

Answer 2

This worked for me. Go to Project->Propertied->Target Frawork->Change frame work like 3.5 to 4.0

Answer 3

I got this after downgrading a project from .net 4.5 to .net 3.5.

To resolve I had to go in to the project - properties - settings window and delete all my settings, save the project, exit and restart visual studio, go back into project - properties -settings window and re-enter all my settings and their default values

Answer 4

You can enable NuGet packages and update you dlls. so that it work. or you can update the package manually by going through the package manager in your vs if u know which version you require for your solution.