# missing_input

**A required input is missing** · HTTP 422

The operation needs an input you didn't send. `missing` lists the field names. Acquestor never substitutes a default it can't source.

**What to do:** Send the named fields. For the SBA ceiling, a capex reserve of 0 is a valid answer; leaving it out is not.

See [errors](/concepts/errors) for the response format.