`traitlets.traitlets:TraitType.error`

Signature

def error(self, obj: HasTraits | None, value: t.Any, error: Exception | None = None, info: str | None = None) → t.NoReturn

Raise a TraitError

obj : HasTraits or None: The instance which owns the trait. If not object is given, then an object agnostic error will be raised.
value : any: The value that caused the error.
error : Exception (default: None): An error that was raised by a child trait. The arguments of this exception should be of the form (value, info, *traits). Where the value and info are the problem value, and string describing the expected value. The traits are a series of TraitType instances that are "children" of this one (the first being the deepest).
info : str (default: None): A description of the expected value. By default this is inferred from this trait's info method.