E3060 Types Errors
Types
wildcard '?' in return type cannot be resolved; at least one parameter must also use '?' to bind the concrete type
When this occurs
This error is triggered when: wildcard '?' in return type cannot be resolved; at least one parameter must also use '?' to bind the concrete type
Example error message
error[E3060]:
wildcard '?' in return type cannot be resolved; at least one parameter must also use '?' to bind the concrete type
How to fix
Review the error message and check your code at the indicated location. The message describes what went wrong — fix the underlying issue it identifies.
Related errors
No related errors.