Ramana,
There are multiple places that JFBConnect copies files too. Please make sure the permissions are set correctly for:
/administrator/components
/components
/modules
/plugins/authentication
/plugins/content
/plugins/system
/plugins/user
In the System Information, there's a Directory Permissions tab. All directories in there should be green and say Writeable. If not, they need to be fixed. Hopefully, you'll get it going from there. If not, if there's more information about what file can't be moved, please let us know.
Thanks,
Alex