Glad I found this posting. Had this 1502 error for the last few months. Seemed to have finally resolved this by setting my Win 10 PC to use a NTP source. I use ca.pool.ntp.org. Haven't had the 1502 error in the last 4 days since making this change. You can google how to do do this. I used elevated priv command line in WIN 10 (w32tm /config /update /manualpeerlist:”ca.pool.ntp.org"). I'm pretty sure you can set this via GUI settings as well. Good luck!