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Error !

AttributeError: 'NoneType' object has no attribute 'items'

21
        class="form-select"
22
      >
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        <option selected disabled>--</option>
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        % for name, title in source.form_data.message_types.items():
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          <option value="${name}">${title}</option>
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        % endfor
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      </select>
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      <label for="${source.ctx_key}_message_type">${_('Type')}</label>
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    </div>
/opt/vnetzone/venv/lib/python3.9/site-packages/vnetzone/templates/components/contact_form.html, line 24:
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        % for name, title in source.form_data.message_types.items():
/opt/vnetzone/venv/lib/python3.9/site-packages/mako/runtime.py, line 947:
947
callable_(context, *args, **kwargs)
/opt/vnetzone/venv/lib/python3.9/site-packages/mako/runtime.py, line 920:
920
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
/opt/vnetzone/venv/lib/python3.9/site-packages/mako/runtime.py, line 878:
878
_render_context(
/opt/vnetzone/venv/lib/python3.9/site-packages/mako/template.py, line 473:
473
return runtime._render(self, self.callable_, args, data)
/opt/vnetzone/venv/lib/python3.9/site-packages/butterpy/renderer.py, line 159:
159
return self.lookup.get_template(tpl_file).render(**context)