POST signup return weird JSON answer

[apiraino]

$ curl -X POST https://host/signup -H "Content-Type: application/json" -d '{"email":"[email protected]", "password":"hey"}'

response has Content-Type: application/json but payload is weird

{"detail":"Data validation error: ValidationErrors(\n    {\n        \"password\": Field(\n            [\n                ValidationError {\n                    code: \"length\",\n                    message: Some(\n                        \"Password too short\",\n                    ),\n                    params: {\n                        \"min\": Number(\n                            6,\n                        ),\n                        \"value\": String(\n                            \"hey\",\n                        ),\n                    },\n                },\n            ],\n        ),\n    },\n)","status":"error"}