Save the changes, log out of SmartPSS, and log back in to refresh the token cache. 4. Adjust Stream Type Preferences

Understanding the technical root causes of this error can help you target the right solution quickly:

When you see "Failed to start playback. NETSDK returns error" , it means SmartPSS was able to locate and communicate with your NVR (otherwise the error wouldn't appear at all), but when it tried to request a playback stream using the NetSDK, the request was rejected or failed. Crucially, — your recordings are still intact. The issue lies somewhere in the path between SmartPSS, the NetSDK, and your NVR's response.

If the issue began after a software update or sudden system crash, replacing the underlying Dahua Network SDK file often remedies the problem. Close the SmartPSS application completely.

The "exclusive" error can sometimes stem from account restrictions.

Below is a comprehensive guide to understanding and resolving this specific NetSDK playback error.

Here is how to fix this issue, ordered from the easiest solution to the most thorough.

When Smart PSS says "NetSDK returns error," it means the software sent a command to the NVR requesting a video stream, and the NVR sent back a rejection packet. The most common hidden error code associated with this message is 0x07 or 0x01 , which translates to or "Exclusive mode locked."