Error when starting a watchdog

Situation

The function F_VN_StartAbsWatchdog or F_VN_StartRelWatchdog permanently returns the error code 16#71A (NOINTERFACE).

Error when starting a watchdog 1:

Solution

Activate the watchdog stack in the corresponding PLC task and then re-activate the configuration Error when starting a watchdog 2:.

Error when starting a watchdog 3: