Vishan, My reply is directed towards the stack trace posted by johnw66. I do not know if it is applicable to your specific situation. To check the subscriptions, you can use the Object Subscription Overview screen. Search by username and sort by logical unit. Also, you can query the database :select username, lu_name, client_url from fnd_obj_subscription order by username, lu_name;
Check to see if the user has multiple subscriptions to the same object.
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