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]

Juni 2017
  Mo Di Mi Do Fr Sa So
22 29 30 31 1 2 3 4
23 5 6 7 8 9 10 11
24 12 13 14 15 16 17 18
25 19 20 21 22 23 24 25
26 26 27 28 29 30 1 2