LinuxQuestions.org - [SOLVED] namebench give some strange

Hey I want to check with namebench, but it gives some strange things:

Code:

bash-4.2# ./namebench.py 

Starting Tk interface for namebench...

No protocol specified

Traceback (most recent call last):

  File "./namebench.py", line 73, in <module>

    namebench.Execute()

  File "/home/toco/Downloads/namebench-1.3.1/libnamebench/tk.py", line 149, in Execute

    self.root = Tk()

  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1685, in __init__

    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)

_tkinter.TclError: couldn't connect to display ":0.0"

I dont know if python is configured right, I've a native Slackware full install here...