KeyError: 'header'

[jpcaveiro]

We are using lots of directives contentui and the following exception does not help to find where the problem is. A possible enhacement is showing some context information.

Exception occurred:
  File "/home/user/.local/lib/python3.6/site-packages/sphinxcontrib/contentui.py", line 76, in run
    self.state.nested_parse(StringList([self.options["header"]]), self.content_offset, par)
KeyError: 'header'