使用django_chartit报错字符串不能解码/编码,求帮助!

keyworkdata = \
    PivotDataPool(
        series =
        [{'options': {
            'source': LOrder.objects.all(),
            'categories': 'com_chnl_name'},
          'terms': {
            'num': Count('serv_id')}}
        ])
keyworkchart = PivotChart(
    datasource = keyworkdata,
    series_options =
      [{'options':{
          'type': 'line',
          'stacking': True},
        'terms': ['num']}])
return render(request, 'keywork/index.html',
              {'keyworkchart':keyworkchart,
               })

{% load chartit %}
{{ keyworkchart|load_charts:"container" }}
<div id='container'> Chart will be rendered here </div>