Meld git clone on Feb. 25th failed to run

sudo python3 setup.py install brought me the following info:

copying data/org.gnome.meld.gschema.xml -> /usr/share/glib-2.0/schemas
running gtk-update-icon-cache
gtk-update-icon-cache -q -t /usr/share/icons/hicolor
compiling gsettings schemas
glib-compile-schemas /usr/share/glib-2.0/schemas
No such key 'Gtk/IMModule' in schema 'org.gnome.settings-daemon.plugins.xsettings' as specified in override file '/usr/share/glib-2.0/schemas/50_sogoupinyin.gschema.override'; ignoring override for this key.
running install_egg_info
Writing /usr/lib/python3/dist-packages/meld-3.19.0.egg-info

When I tried to run meld, I got the following error message:

$ meld
Traceback (most recent call last):
  File "/usr/bin/meld", line 358, in <module>
    import meld.meldapp
  File "/usr/lib/python3/dist-packages/meld/meldapp.py", line 29, in <module>
    import meld.ui.util
  File "/usr/lib/python3/dist-packages/meld/ui/util.py", line 20, in <module>
    from meld.ui import gladesupport  # noqa: F401
  File "/usr/lib/python3/dist-packages/meld/ui/gladesupport.py", line 8, in <module>
    from meld import linkmap  # noqa: F401
  File "/usr/lib/python3/dist-packages/meld/linkmap.py", line 136, in <module>
    LinkMap.set_css_name("link-map")
AttributeError: type object 'LinkMap' has no attribute 'set_css_name'

Can anybody help please? I'm using Ubuntu 16.04.3 + Python 3.5.2

Cheers Pei