` args.py #504:
for k, v in dictionary.items():
# if key is not present in the task's parameters, assume we didn't get this far when running
# in non-remote mode, and just add it to the task's parameters
if k not in parameters:
self._task.set_parameter((prefix or '') + k, v)
continue

task.py #1266:
def set_parameter(self, name, value, description=None, value_type=None):
# type: (str, str, Optional[str], Optional[Any]) -> ()
"""
Set a single Task parameter. This overrides any previous value for this parameter.

    :param name: The parameter name.
    :param value: The parameter value.
    :param description: The parameter description.
    :param value_type: The type of the parameters (cast to string and store)
    """
    if not Session.check_min_api_version('2.9'):
        # not supported yet
        description = None
        value_type = None

    self._set_parameters(
        {name: value}, __update=True,
        __parameters_descriptions={name: description},
        __parameters_types={name: value_type}
    )

task.py #1227:
def create_description():
if org_param and org_param.description:
return org_param.description
created_description = ""
if org_k in descriptions:
created_description = descriptions[org_k]
if isinstance(v, Enum):
# append enum values to description
if created_description:
created_description += "\n"
created_description += "Values:\n" + ",\n".join(
[enum_key for enum_key in type(v).dict.keys() if not enum_key.startswith("_")]
)
return created_description `We can see from this code that the description will always be None (because copy_to_dict never passes a description, it defaults to None and is always put in the descriptions dict as None), and if the arg is an Enum it will always throw the exception