Error message

Warning: Creating default object from empty value in calendar_plugin_row->pre_render() (line 312 of /var/www/html/sites/all/modules/calendar/includes/calendar_plugin_row.inc).

Status message

Debug:
'calendar_plugin_style: A date argument is required when using the calendar style, but it is missing or is not using the default date.'
in calendar_plugin_style->render() (line 238 of /var/www/html/sites/all/modules/calendar/includes/calendar_plugin_style.inc).