What does the VARTA error `validation_error` mean?

HTTP status: 422  ·  Type: invalid_request_error

What it means

FastAPI's own request-schema validation rejected the request before any handler ran.

What causes it

Raised by the /v1 request-validation handler (backend/app/api/v1/errors.py) whenever a request body fails schema validation — a field of the wrong type, or missing a required key the model declares.

What to do

Read message for the specific validation failure and param for the field name (drawn from the validator's error location), then fix that field's type or presence.