[HELP] Bungeecord upstreambridge

hi guys im running a bungee server and I cant join and I goto to config to see this :

03.07 11:29:42 [Server] INFO -> UpstreamBridge has disconnected
03.07 11:29:42 [Server] INFO disconnected with: Exception Connecting:IOException :

so please help and heres my config :

groups:
teddybear4455:
- admin
disabled_commands:
- disabledcommandhere
player_limit: -1
stats: 3c023815-502e-42b6-a262-fa5c2739bdc6
permissions:
default:
- bungeecord.command.server
- bungeecord.command.list...

[HELP] Bungeecord upstreambridge