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The type or namespace name 'ContractClassFor' could not be found (are you missing a using directive or an assembly reference?)

I am using the following code.

[ContractClassFor(typeof(IWindow))]

Why the error "The type or namespace name 'ContractClassFor' could not be found (are you missing a using directive or an assembly reference?)" is coming?

It is happened because of an ambiguity issue. I removed Microsoft.Contracts from reference. Now its working fine. Thanks Mr.Frebin Francis for your support.

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