This is a complete list of all the error codes that are emitted by Delivery Mangaer. The vast majority of these errors will never be seen by the user (or the developer). They are included here for completeness.
MetaPack Support are automatically notified of all errors.
Errors are split into the following classes:
Internal, critical error preventing the whole system from working properly. Action: MetaPack handle these automatically.
Validation errors. These are usually in response to the input you've provided, but also cover things like invalid arguments to URLs, and security violations. Action: Check your input parameters.
Communication errors. These tend to be temporary and sometimes even resolve themselves. Action: Wait and try later, or contact MetaPack support if it continues.
Database problems. These occur when there is an issue with the database. Action: There is nothing you can do here, besides report it to MetaPack.