the error

root@beaglebone:~# systemctl status cam.service
cam.service - <description of code>
          Loaded: loaded (/etc/systemd/system/cam.service; enabled)
          Active: failed (Result: exit-code) since Thu, 15 May 2014 02:51:32 +0000; 16min ago
         Process: 605 ExecStart=/usr/bin/camera.sh (code=exited, status=127)
          CGroup: name=systemd:/system/cam.service

May 15 02:51:32 beaglebone camera.sh[605]: /usr/bin/camera.sh: line 2: cd: HOME not set
May 15 02:51:32 beaglebone camera.sh[605]: /usr/bin/camera.sh: line 3: cd: mjpg-streamer: No such file or directory
root@beaglebone:~#