_tkinter.TclError: couldn't connect to display ":0"

[barbarasilveiraf]

File "/home/luser/.local/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 171, in new_figure_manager return cls.new_figure_manager_given_figure(num, fig) File "/home/user/.local/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 1049, in new_figure_manager_given_figure window = Tk.Tk(className="matplotlib") 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: couldn't connect to display ":0"