old_contents: from cms.plugin_pool import plugin_pool
  from cms.plugin_base import CMSPluginBase
  from djangocms_column.models import MultiColumns, Column
  from django.utils.translation import ugettext_lazy as _
  from djangocms_column.forms import MultiColumnForm
  from cms.models import CMSPlugin
  
  class MultiColumnPlugin(CMSPluginBase):
      model = MultiColumns
      module = _("Multi Columns")
      name = _("Multi Columns")
      render_template = "cms/plugins/multi_column.html"
      allow_children = True
      child_classes = ["ColumnPlugin"]
      form = MultiColumnForm
  
      def render(self, context, instance, placeholder):
          context.update({
              'instance': instance,
              'placeholder':placeholder,
          })
          return context
  
      def save_model(self, request, obj, form, change):
          response = super(MultiColumnPlugin, self).save_model(request, obj, form, change)
          for x in xrange(int(form.cleaned_data['create'])):
              col = Column(parent=obj, placeholder=obj.placeholder, language=obj.language, width=form.cleaned_data['create_width'], position=CMSPlugin.objects.filter(parent=obj).count(), plugin_type=ColumnPlugin.__name__)
              col.save()
          return response
  
  class ColumnPlugin(CMSPluginBase):
      model = Column
      module = _("Multi Columns")
      name = _("Column")
      render_template = "cms/plugins/column.html"
      parent_classes = ["MultiColumnPlugin"]
      allow_children = True
  
      def render(self, context, instance, placeholder):
          context.update({
              'instance': instance,
              'placeholder':placeholder,
              })
          return context
  
  plugin_pool.register_plugin(MultiColumnPlugin)
  plugin_pool.register_plugin(ColumnPlugin)
  
new_contents: from cms.plugin_pool import plugin_pool
  from cms.plugin_base import CMSPluginBase
  from djangocms_column.models import MultiColumns, Column
  from django.utils.translation import ugettext_lazy as _
  from djangocms_column.forms import MultiColumnForm
  from cms.models import CMSPlugin
  
  class MultiColumnPlugin(CMSPluginBase):
      model = MultiColumns
      module = _("Multi Columns")
      name = _("Multi Columns")
      render_template = "cms/plugins/multi_column.html"
      allow_children = True
      child_classes = ["ColumnPlugin"]
      form = MultiColumnForm
  
      def render(self, context, instance, placeholder):
          context.update({
              'instance': instance,
              'placeholder':placeholder,
          })
          return context
  
      def save_model(self, request, obj, form, change):
          response = super(MultiColumnPlugin, self).save_model(request, obj, form, change)
          for x in range(int(form.cleaned_data['create'])):
              col = Column(parent=obj, placeholder=obj.placeholder, language=obj.language, width=form.cleaned_data['create_width'], position=CMSPlugin.objects.filter(parent=obj).count(), plugin_type=ColumnPlugin.__name__)
              col.save()
          return response
  
  class ColumnPlugin(CMSPluginBase):
      model = Column
      module = _("Multi Columns")
      name = _("Column")
      render_template = "cms/plugins/column.html"
      parent_classes = ["MultiColumnPlugin"]
      allow_children = True
  
      def render(self, context, instance, placeholder):
          context.update({
              'instance': instance,
              'placeholder':placeholder,
              })
          return context
  
  plugin_pool.register_plugin(MultiColumnPlugin)
  plugin_pool.register_plugin(ColumnPlugin)
  
subject: Update cms_plugins.py