Hi Dhairya
Glad you have got this working. The error link didn't show for me so thought it must have had information on the error.
In legacy notifications - the messages were created and placed in a queue and sent when required to be sent . The system would determine that the notification had not been sent to a number of users who already met the criteria for receiving that notification, and would then send that notification to those users. In most cases, this was not the intended outcome. Legacy seminar notifications are sent to the Alert block by default and these by default send an email . It is possible to change the default message outputs or a usersso the email output is disabled
In centralised notifications the notifications are not queued the event trigger is checked to evaluate what notifications should have been sent between now and the last time that notifications were sent.
regards