Calendar Base Error

Message: Missing or wrong parameter. The event you are looking for could not be found.

Note: Please verify your URL parameter: tx_cal_controller[uid]

URL:http://gruene-mv.de/termine/termin-detail/cal/event//tx_cal_phpicalendar/2019/03/19/oeffentliche_sitzung_der_stadtfraktion_neubrandenburg-4/