Your application seems to be working fine.
I am guessing the issue is with your url. open your netweaver administration page where Nakisa is deployed put OrgChart/manager.jsp next to the port number/.
I see you have latest release of Nakisa orgchart which is not even on service market place yet.
I am assuming you may have upgraded Nakisa in your environment to latest.
Confirm if you have undeployed old orgchart app before deploying new.
Also confirm if you have it on NW7.3 atleast as Stephan mentioned?
This looks like simple issue. Need some more info to help you on this.
Thanks,
Hardeep