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:https://gruene-nuernberger-land.de/ortsverbaende/ov-lauf-an-der-pegnitz/termine/cal/event/tx_cal_phpicalendar/2020/02/20/photovoltaik_sonne_nuetzen_klima_schuetzen/