Background Information

You receive an HTTP 422 error when you run certain scripts.

Answer

This error is an API call failure. Currently, the known reasons for this error are:

  1. You have exceeded the Amazon Web Services EBS volume limit (see Increase my AWS limits). You will need to delete some of your volumes.
  2. You have more than 16 EBS snapshots in a pending state.
  3. You are trying to perform a backup on a MySQL server that is neither a master nor a slave.
  4. There may be other causes that are not yet documented.
  5. You use the API to run a script, and that script is missing an input.