title: Gtk problem :ModuleNotFoundError: No module named 'gtk'
body: <p>I have installed gnuhealth and when I run the gnuhealthclient and login with my username and password it shows an error message with gtk problem : no module found</p>
  <p>I am using centos 7  and I already installed gtk+ and gtk3 with these commands:</p>
  <p><strong>$sudo yum install gtk3</strong></p>
  <p><strong>$sudo yum install gtk3-devel</strong></p>
  <p><strong>$sudo yum install gtk+</strong></p>
  <p>When I check the list of installed packages I found gtk+ and gtk3 and even gtk 2</p>
  <p>Can anyone tell me what is the problem?</p>
  <p>Here’s the error msg:</p>
  <pre><code>
      if not self.screen.row_activate() and self.children_field:
  
    File &quot;/home/gnuhealth/.local/lib/python3.6/site-packages/tryton/gui/main.py&quot;, line 707, in menu_row_activate
  
      }, warning=False)
  
    File &quot;/home/gnuhealth/.local/lib/python3.6/site-packages/tryton/action/main.py&quot;, line 195, in exec_keyword
  
      Action._exec_action(action, data, context=context)
  
    File &quot;/home/gnuhealth/.local/lib/python3.6/site-packages/tryton/action/main.py&quot;, line 155, in _exec_action
  
      context_domain=action['context_domain'])
  
    File &quot;/home/gnuhealth/.local/lib/python3.6/site-packages/tryton/gui/window/window.py&quot;, line 31, in create
  
      from .form import Form
  
    File &quot;/home/gnuhealth/.local/lib/python3.6/site-packages/tryton/gui/window/form.py&quot;, line 9, in &lt;module&gt;
  
      import gtk
  ModuleNotFoundError: No module named 'gtk'```
  
  </code></pre>