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-augsburg.de/termine/cal/event/tx_cal_phpicalendar/2021/09/18/gruene-meile-gastromeile-freizeitmeile-ideen-fuer-eine-autofreie-maxstrasse/