Send Test Email Error in Campaign's Email step: An error occurred, please try again

If you see this error message, or if the Send Email Trigger Action is Not FiringPlease check if1. the email/sms content for missing } or overusing {{{2. the custom values are valid: especially the links: List of valid Custom values3. the email addresses are valid: e.g. test@gmail,com with a comma as the dot4. From field is in the format of an email address: e.g.

Change ABC company to its email like [email protected]