@hungdaingoc
Unable to reproduce your issue.
I received fingerprints from 20 threads, each thread receiving one fingerprint with PerfectCanvas and one without.
90cc9f4f-d027-42ec-8200-8d5b1f4bdce6-image.png
As far as I understand, you're getting errors when retrieving fingerprints from PerfectCanvas. I've had similar errors, but it's related to my internet provider blocking access to the servers.
Try using a VPN. You can also use the built-in proxy functionality:
https://wiki.bablosoft.com/doku.php?id=ru:connectionconfig