Could not load file or assembly 'system.web.http' or one of its dependencies. The located seembly's manifest definition does not match the assemblr reference (Exception from HRESULT : 0x80121040)

Hello,

Sometime we receive below error message.

Could not load file or assembly 'system.web.http' or one of its dependencies. The located seembly's manifest definition does not match the assemblr reference (Exception from HRESULT : 0x80121040)



Solution :-
It will be fix with reinstall of Package.
Run below command in Package manager.


Update-Package Microsoft.AspNet.WebApi -reinstall

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