Hi Paneendra,
I recommend to check <RA Server>/logs/nolio_export.log on RA Management Server.
If following logs are recorded repeatedly, you should restart RA server daemon/service and don't export the application because of similar reason with another thread.RA 552 Export error
It is possible to reoccur when you attempt to export problematic application.
2017-01-13 17:26:04,564 [http-nio-8080-exec-3] DEBUG (com.nolio.platform.server.dataservices.services.exportimport.model.exportdata.DataExporter:107) - the flow [NNNN] cannot be exported yet- either target [ExecutableInstance{name='<Name>',id=NNNN}] or source[ExecutableInstance{name='<Name>',id=NNNN}] haven't been exported yet
If your environment is in this situation, please open a support case.
Thanks
Yas