ERROR:tryton.common.common: File "tryton/tryton/gui/window/form.py", line 302, in sig_new
self.screen.new()
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 448, in new
self.switch_view('form')
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 369, in switch_view
self.load_view_to_load()
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 390, in load_view_to_load
self.add_view_id(view_id, view_type)
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 403, in add_view_id
return self.add_view(view)
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 437, in add_view
children_field=children_field)
File "tryton/tryton/gui/window/view_form/view/widget_parse.py", line 40, in parse
fields)
File "tryton/tryton/gui/window/view_form/view/form_gtk/parser.py", line 318, in parse
notebook, tooltips=tooltips)
File "tryton/tryton/gui/window/view_form/view/form_gtk/parser.py", line 375, in parse
notebook, tooltips=tooltips)
File "tryton/tryton/gui/window/view_form/view/form_gtk/parser.py", line 420, in parse
widget_act = WIDGETS_TYPE[ftype][0](name, model_name, attrs)
File "tryton/tryton/gui/window/view_form/view/form_gtk/one2many.py", line 181, in __init__
exclude_field=attrs.get('relation_field', None))
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 98, in __init__
self.switch_view()
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 369, in switch_view
self.load_view_to_load()
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 390, in load_view_to_load
self.add_view_id(view_id, view_type)
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 403, in add_view_id
return self.add_view(view)
File "tryton/tryton/gui/window/view_form/screen/screen.py", line 437, in add_view
children_field=children_field)
File "tryton/tryton/gui/window/view_form/view/widget_parse.py", line 40, in parse
fields)
File "tryton/tryton/gui/window/view_form/view/list_gtk/parser.py", line 139, in parse
treeview, node_attrs)
'NoneType' object is not callable