Getting error in ubuntu

[challs1]

I have installed in ubuntu server and added all the dependiences that was required but still iam facing the issue. Can u help me to sort it out????

Traceback (most recent call last):
File "aws_inventory.py", line 320, in
main(parse_args())
File "aws_inventory.py", line 317, in main
aws_inventory.invoker.ApiInvoker(args, service_descriptors, ops_count).start()
File "/home/ubuntu/saipoc/aws-inventory/aws_inventory/invoker.py", line 44, in start
self._probe_services)
File "/home/ubuntu/saipoc/aws-inventory/aws_inventory/progress.py", line 16, in init
ttk.Frame.init(self, relief='ridge', borderwidth=2)
File "/usr/lib/python2.7/lib-tk/ttk.py", line 738, in init
Widget.init(self, master, "ttk::frame", kw)
File "/usr/lib/python2.7/lib-tk/ttk.py", line 551, in init
master = setup_master(master)
File "/usr/lib/python2.7/lib-tk/ttk.py", line 354, in setup_master
master = Tkinter._default_root or Tkinter.Tk()
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1818, in init
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable

[bitsandsalsa]

The tool has a GUI component. I think your issue is that your Ubuntu server is not set up for GUI apps. If you are remotely connecting to your server over SSH, you can try to use the X forwarding feature. It is enabled with the -X commandline option to ssh.