class_docstr: Marshmallow validation error for dashboard slug already exists
class_docstr_tok: ["Marshmallow","validation","error","for","dashboard","slug","already","exists"]
code: def __init__(self) -> None:
      super().__init__([_("Must be unique")], field_name="slug")
  
imports: from typing import Optional
  from flask_babel import lazy_gettext
  from marshmallow.validate import ValidationError
  from superset.commands.exceptions import CommandInvalidError, CreateFailedError, DeleteFailedError, ForbiddenError, ImportFailedError, ObjectNotFoundError, UpdateFailedError
label_desc: Use image node_id 1 to create a new DashboardSlugExistsValidationError object from inherited base classes: ValidationError with example: obj = DashboardSlugExistsValidationError()