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48003: Callback returned an invalid response

ERROR: 48003

FRONTLINE

ERROR

Description

Callback returned an invalid response

Possible Causes

Your Frontline integration service returned a response which is invalid.
Your service returned a response that was too large. Responses are capped at 64k.

Possible Solutions

Make sure that callback returns a valid JSON which has the required fields that are defined in Frontline Docs.
Make sure that your response size is less than 64k.