. When you click play, SmartPSS sends a command through this kit to the recorder. If the recorder sends back a "null" or "error" response instead of a video stream, the software displays the generic NetSDK error. This usually points to a handshake failure rather than a hardware failure of the hard drive itself. While the error sounds technical, it is usually a sign of a weak connection outdated software

Troubleshooting: "Failed to Start Playback - NETSDK Returns Error" in SmartPSS