Welcome, @Xueqian_Yin
When working at that server, you should use the resources they host to ask questions, especially for errors that seem to be server side.
I just checked again and they do have a dedicated forum. The link is on the server’s homepage. I needed to copy and paste it into a new browser window to get the connection correct. Maybe try that way too? Or, just go here: https://forum.biobakery.org/