Since the error is a "Not Supported" flag, "fixing" it usually involves adjusting your software settings to match what your hardware can actually do:
: If you get this error during live view or playback, right-click the camera channel and select Main Stream hikvision error code hcnetsdkdll 23 install
To fix an error, you must first understand it. Since the error is a "Not Supported" flag,
If you want, provide the HCNetSDK version, OS/bitness, and the exact error text or a screenshot and I’ll give a step-by-step resolution tailored to that environment. Priya dug into Windows’ environment variables
An older version of the DLL exists from a previous installation, creating a conflict.
Priya dug into Windows’ environment variables. There it was: two entries pointing to different versions of HCNetSDK.dll — one from an old backup system, one from the new install. The NVR’s software was picking up the wrong one.