Cause
A text is shorter or longer than allowed. details.field names the field and details.max the maximum, in a survey document, details.max_bytes.
What to do
Adjust the field to the limits on the API page.
application/problem+json
{
"type": "https://masnet.com/developers/errors/field_length",
"title": "Invalid length",
"status": 422,
"detail": "...",
"code": "field_length",
"correlation_id": "..."
}