Hi Ayitharaju Prasanna vani,
Try to give the Entity access for the user Role.
As Maarten suggests, Create new entity extend System. File entity. Then to give access for the new entity, open security document from your module give entity access for Requestor user role.
The userrole requester(which can acces this page) does not have read acces on the filedocument entity.
Probably the best way forward is to create a new entity that inherits from the System.FileDocument entity and set specific access rights on the entity for the requester. Then use this new entity on your page here in stead of the system.filedocument entity.
Hope this helps!
Open your project Security Settings and Edit Requester user role and map User module role in System module.
As Dinesh said map User module role it will work and Add the Read & write access.