Could not load file or assembly 'System.Buffers, Version='


I'm getting the following exception when trying to call GetDatabase method of the MongoClient class after adding a new configuration using VS config. manager:

Could not load file or assembly 'System.Buffers, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I installed the latest System.Buffer nuget package v4.5.1, created dependentAssembly in my app.config and Reference in my .csproj file, but I still have the same issue. For some reason it tries to reference System.Buffer with v4.0.2. Has anyone had a similar error and how did you solve it?

asked on Stack Overflow Jul 21, 2020 by Adam Jensen • edited Jul 22, 2020 by Hi Guy

1 Answer


Could not load file or assembly 'System.Buffers, Version=…'


1) use CMD(run as Administrator ) and type

 cd xxxx(xxxx\packages\System.Buffers.4.5.1\lib\netstandard2.0))


gacutil /i System.Buffers.dll

Then, when you finish it, please run update-package -reinstall under package manager console to reinstall the package.

2) you can try to change Version= to Version= in csproj file.

Besides, there is a similar issue you can refer to.

answered on Stack Overflow Jul 22, 2020 by Perry Qian-MSFT • edited Aug 27, 2020 by Perry Qian-MSFT

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