Thanks for reply, Please tell if deleting the xml of the corresponding task can help me or not. Documents I have but new folder structure has been mounted in the server. Shall I point it to the old location and then use the same document. But even in this case current tasks are to be deleted and the documents that have been added to the old folder structure should be related to the unwanted tasks displayed. I am unable to see the document linked to the tasks in source documents folder and if I try to create the tasks with the same name it is not allowing me as it is appending "2" at the end of the task name.
Thanks & Regards
You cannot must revert back to your old structure for a while until you clean this mess.
you need not to create task just retain old structure as it is.
Once you did that make sure you delete tasks first followed by Applications later and then you change change the folder structure you like