demo is not running when something is error.

[H-TWINKLE]

Thank you provide this good tool, i use it to proxy mysql and pg by this tool.
when i use it ,it is not worked.
this is error msg on server :

this is server config file:

Host: 0.0.0.0
Port: 7889
Path: /proxy
Auth: 123456

this is error msg on client:

WebsocketServer: ws://192.168.2.7:7889/proxy
Auth: 123456
Targets:
  - LocalHost: 192.168.2.7
    LocalPort: 25001
    RemoteHost: 192.168.2.7
    RemotePort: 3307
  - LocalHost: 192.168.2.7
    LocalPort: 25002
    RemoteHost: 192.168.2.7
    RemotePort: 5433

how can i solve this problem ?