Playback Error

Hi

I wanted to ask for some assistance. I have a HIK wireless NVR. The cameras connected to it are also HIKVision brand (cube camera).

The recording works fine because the timeline shows a bar that shows there are recorded videos.

If I choose to playback the recorded videos, an error appears on the web browser, it says "playback failed".

I am hoping somebody has encountered and found a solution for this.

Thank you.