I have implemented heartbeat concept in two applications and added two custom performance counters(per application) in my PRTG application. One application is running fine and giving proper heartbeat count however second counter always failing with "The specified object is not found on the system. (Performance Counter error 0xC0000BB8)". I also checked heartbeat count with performance monitor for both the application and it is working fine. Note:- Both application is running on one pc.