Here are the possible error messages, which return if any condition gets failed or required data is missing for processing.
Lead retriever allowed is not enabled for this exhibitor
Only 50 Characters are allowed in firstName
Only 50 Characters are allowed in lastName
Only 75 Characters are allowed in email
You have already used your ticket
Exhibitor already exists
The request could not be understood by the server due to malformed syntax.
You are not authorized to view the resource.
Accessing the resource you were trying to reach is forbidden.
The resource you were trying to reach is not found.