Got many pool rejected hash
Hi!
I got many messages {"identifier":"error","param":"pool rejected hash"}
I use pool { "url" : "gulf.moneroocean.stream", "port" : 10001, "emptypassword" : "", "algorithm" : "cn"}
<img width="1008" alt="Снимок экрана 2020-02-08 в 15 55 11" src="https://user-images.githubusercontent.com/8538207/74085634-f6380f00-4a8b-11ea-85b2-86405276fc14.png">

Why this can occur?