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Could not load file or assembly 'WebMatrix.Data' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Hi

I am using Visual studio 2015 to build a MVC project and I am getting this error. Please provide some help in resolving it.

Could not load file or assembly 'WebMatrix.Data' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Thank you,
Ritesh

Miguel Oz

This error typically happens when you have different DLL versions in your PC.
Possible solutions:
1. Delete all files from bin folder then clean and rebuild the solution .
2. Find the right assembly by putting it in the GAC or in the application path. For more info check :
https://blogs.msdn.microsoft.com/junfeng/2004/03/25/the-located-assemblys-manifest-definition-with-name-xxx-dll-does-not-match-the-assembly-reference/

If more help needed please post the full error message and your web.config (or other config file) that uses this assembly dll.

Ryan Chong

have you also tried to remove all the References of WebMatrix from your project and re-add it back?

when you re-add it back (perhaps via Nuget), make sure you add it with the correct version.

WebMatrix.Data
https://www.nuget.org/packages/WebMatrix.Data/

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