FieldError

FieldError = 'blank' | 'not_selected' | 'invalid' | 'not_in_state' | 'invalid_characters' | 'contains_emoji' | 'too_long'

What can be wrong with a value: the keys of Field.errors, and the code of a ValidationError.

ErrorDescription
blankA required text field left empty
not_selectedNothing chosen in a required list
invalidNot the field's format, or not in its list
not_in_stateA postcode not the state's (validate only)
invalid_charactersA name with digits or symbols
contains_emojiAny field holding an emoji
too_longLonger than input.max_length