Cannot implicitly convert type

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.NET4.6

i created library project. Inside library project created one class and one interface.Interface has some methods. Class has some properties. On same solution i created another library project. I added entity framework and one class. This class has inherit previous project interface file. And when i implement the interface members in another class file using entity framework. It gives an error

Quote:

Error CS1503 Argument 1: cannot convert from 'CRUDApp.Core.EmployeeRegistration' to 'CRUDApp.Infrastructure.Employee'

What I have tried:

void Add(EmployeeRegistration employeeRegistration);

Interface Member This Member can implemented in another class.

EmployeeRegistration 

is a class contains some Properties

public void Add(EmployeeRegistration employeeRegistration)
       {
           employeeEntities.Employees.Add(employeeRegistration);
           employeeEntities.SaveChanges();
       }