Sorry, missed this info from the Integration_Server_Built-In_Services_Reference:
[INDENT]triggerName – String – Fully qualified name for the new trigger that uses any combination
of letters, and/or the underscore character. Make sure to specify the name
of the folder and subfolder in which you want to save the trigger.
[/INDENT]
ssagar it means that u need to specify the folder,subfolder name in order to create a trigger .
example folder.subfolder:triggername so that it create trigger remember not to write the package name there in the next package variable write the package name .