code: def check(cls, value, full_schema, path, expected_len):
      if len(value) != expected_len:
          raise SchemaLengthValidationError(
              value, full_schema, path, expected_len
          )
  
imports: from dash.exceptions import InvalidCallbackReturnValue
  from ._utils import AttributeDict, stringify_id
label_desc: Use image node_id 2 for calling the SchemaLengthValidationError obj's underlying member method code with example usage: obj.check(cls, value, full_schema, path, expected_len) without return types