I downloaded Indicator-Char and unzipped the files. I added the characters there I wanted perfectly. When I run the python script it loads the daemon and I can see this characters. But the problem is that when I click on them, not copied anything to the clipboard.

I see the code where is the copy function, is the following.

def on_char_click(self, widget, char):
    cb = gtk.Clipboard(selection="PRIMARY")
    cb.set_text(char)

Is a syntax problem? There is a problem on my system?