class_docstr: Common base class for Command Invalid errors.
code: def append(self, exception: ValidationError) -> None:
      self._exceptions.append(exception)
  
imports: from typing import Any, Optional
  from flask_babel import lazy_gettext
  from marshmallow import ValidationError
  from superset.exceptions import SupersetException
label_desc: Use image node_id 2 for calling the CommandInvalidError obj's underlying member method code with example usage: obj.append(exception) without return types