Issue in resistering generic type in unity.

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Unity

How to register generic repository in Unity.
I am doing this
container.RegisterType(typeof(IRepository<>), typeof(Repository<>));
But it is not working

Throwing below exception

Resolution of the dependency failed, type = "StudentManagement.IData.IRepository.IRepository`1[StudentManagement.Models.Model.Studentcontacts]", name = "(none)".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type, StudentManagement.IData.IRepository.IRepository`1[StudentManagement.Models.Model.Studentcontacts], is an interface and cannot be constructed. Are you missing a type mapping?
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At the time of the exception, the container was:

Resolving StudentManagement.IData.IRepository.IRepository`1[StudentManagement.Models.Model.Studentcontacts],(none)

urgent help will be highlt appricable