Program dont come up after install

[red0bear]

Hello,
after i compile files and try execute i get these messages. Can you help me ?

Unable to init server: Could not connect: Connection refused
Unable to init server: Não foi possível conectar: Connection refused

(wattmanGTK:30452): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion 'GDK_IS_DISPLAY (display)' failed
Traceback (most recent call last):
  File "/usr/bin/wattmanGTK", line 11, in
    load_entry_point('WattmanGTK==0.0.1', 'console_scripts', 'wattmanGTK')()
  File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 489, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 2843, in load_entry_point
    return ep.load()
  File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 2434, in load
    return self.resolve()
  File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 2440, in resolve
    module = import(self.module_name, fromlist=['name'], level=0)
  File "/usr/lib/python3.6/site-packages/WattmanGTK/wattman.py", line 16, in
    from WattmanGTK.handler import Handler # handles GUI
  File "/usr/lib/python3.6/site-packages/WattmanGTK/handler.py", line 22, in
    from WattmanGTK.plot import Plot
  File "/usr/lib/python3.6/site-packages/WattmanGTK/plot.py", line 20, in
    from matplotlib.backends.backend_gtk3cairo import FigureCanvasGTK3Cairo as FigureCanvas # required for GTK3 integration
  File "/usr/lib64/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py", line 6, in
    from . import backend_gtk3
  File "/usr/lib64/python3.6/site-packages/matplotlib/backends/backend_gtk3.py", line 54, in
    cursors.MOVE          : Gdk.Cursor.new(Gdk.CursorType.FLEUR),
TypeError: constructor returned NULL