Cause
The resource changed since you last read it.
What to do
Reload it and repeat with the new version.
application/problem+json
{
"type": "https://masnet.com/developers/errors/precondition_failed",
"title": "Precondition failed",
"status": 412,
"detail": "...",
"code": "precondition_failed",
"correlation_id": "..."
}