Required type: List <T> Provided: List <Teacher>

The error message indicates that there is a type mismatch.

You are trying to pass a `List<Teacher>` to a parameter that requires a `List<T>`. This means that the method or function is expecting a list of a generic type `T`, but you are passing a list of type `Teacher`.

To resolve this error, you can either change the parameter type to `List<Teacher>` or make sure that the list you are passing is of the correct generic type `T`.