If you're using an Amcrest camera with an SD card, this is a highly effective fix. A user on the Amcrest forum with an identical "NETSDK returns error" was able to solve the problem immediately by doing the following:
Typically C:\Program Files\Smart Professional Surveillance System\SmartPSS . failed to start playback netsdk returns error smart pss best
Dahua frequently updates the NetSDK libraries within the software to fix bugs. If you're using an Amcrest camera with an
Select the user profile encountering the error and click (the pencil icon). Open the Authority or Monitor permissions tab. Select the user profile encountering the error and
If your system suddenly shows this error after working normally for months, a hung network socket is the likely culprit. Keep the SmartPSS application open. Press to open the Windows Task Manager .
: If the error started suddenly after a time change, check your NVR and PC clocks. Mismatched DST settings can cause the SDK to request video from a "time" that the recorder doesn't recognize.
: If you can see live views but playback fails, the storage (SD card or HDD) might be corrupted. Users have found that reformatting the SD card or checking the HDD status on the NVR often fixes the issue.