Configuration property is not proper

The xBlog plugin Mini Calendar needs the property: TCA..ctrl.extensions.xblog.pi17.datefield
But property is not set or is empty.

Please take care of a proper TCA configuration or do not use with the xBlog plugin Mini Calendar.

Sorry for the trouble. Error occors @ Netzmacher\Xblog\Controller\MiniCalController::_getFlexformDatefield#139