NameError: name 'get_default_scheme' is not defined. Did you mean: '_get_default_scheme'?

This error message indicates that the name 'get_default_scheme' is not defined in the current scope. It suggests that perhaps you meant to use the function '_get_default_scheme' instead. You should check your code for any typos or incorrect function names. If you intended to define the 'get_default_scheme' function, make sure it is properly defined before it is called.