Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies

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 .

Answer 1

I had this same problem - some users could pull from git and everything ran fine. Some would pull and get a very similar exception:

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

In my particular case it was AjaxMin, so the actual error looked like this but the details don't matter:

Could not load file or assembly 'AjaxMin, Version=4.95.4924.12383, Culture=neutral, PublicKeyToken=21ef50ce11b5d80f' or one of its dependencies. The system cannot find the file specified.

It turned out to be a result of the following actions on a Solution:

1. NuGet Package Restore was turned on for the Solution.

2. A Project was added, and a Nuget package was installed into it (AjaxMin in this case).

3. The Project was moved to different folder in the Solution.

4. The Nuget package was updated to a newer version.

And slowly but surely this bug started showing up for some users.

The reason was the Solution-level packages/respositories.config kept the old Project reference, and now had a new, second entry for the moved Project. In other words it had this before the reorg:

  <repository path="..\Old\packages.config" />

And this after the reorg:

  <repository path="..\Old\packages.config" />
  <repository path="..\New\packages.config" />

So the first line now refers to a Project that, while on disk, is no longer part of my Solution .

With Nuget Package Restore on, both packages.config files were being read, which each pointed to their own list of Nuget packages and package versions. Until a Nuget package was updated to a newer version however, there weren't any conflicts.

Once a Nuget package was updated, however, only active Projects had their repositories listings updated. NuGet Package Restore chose to download just one version of the library - the first one it encountered in repositories.config, which was the older one. The compiler and IDE proceeded as though it chose the newer one. The result was a run-time exception saying the DLL was missing.

The answer obviously is to delete any lines from this file that referenced Projects that aren't in your Solution.

Answer 2

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 3

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

Answer 4

I had the problem under Linux and I needed to install those. I don't know which one actually fixed the problem, but that error was gone after that:

apt-get install mono-utils mono-runtime-sgen mono-runtime-common \
                mono-runtime-boehm mono-runtime-dbg mono-xbuild

Answer 5

我已经见过几次了，它通常通过在 .NET Framework（无论应用程序尝试使用哪个版本）上运行修复来修复。

Answer 6

You are using .net 4? - Maybe on the clients there is only the ".net framework 4 client profile" installed. Try to install full package!! Download here

Answer 7

就我而言，我能够通过在 web.config 文件中设置 Debug=true 来找到 ScriptManager 的问题

Answer 8

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 9

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.

Answer 10

即使我遇到了一些更奇怪的事情，我可以看到加载 dll 的 GAC 中没有 dll 但 windows > 模块显示 system.dll version=4.0.0.0 已加载

Answer 11

i just changed my target .net framework and it worked .in my case i changed from .net 4.7 to .net 4. Right click your solution and select properties selct properties

Click Application >> Target Framework

Answer 12

FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=7.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified.

this is my problem. I installed system.configuration assembly in the project and other class libraries also. now the problem has gone.

Answer 13

i have the same issue happened on my MS Surface Pro (5th gen). After turning on the surface pro, immediately i got this exception and my entire screen went blackout. I couldn't press/click anything except to shutdown by long press and hold power buttton for 30s. The tablet is for Siemens application. error picture

Answer 14

我使用了带有 aspcore.report 的 net 6.0，这样的问题发生在我身上我在服务器项目中安装了 system.configuration 程序集，问题解决了