Velocity proxy "invalid configuration"

[TheArchitectMC2]

Hello, im actually configuring a minecraft server with a proxy (velocity), the minecraft server (lobby) comes from an another mc host, idk where the problem, i follow the official proxy guide and its still tell me the configuration file is invalid,can you guys help me solve it?

[ScOp_E]

did you ever find a solution?

[_Tarna_]

make sure the json file for the external servers is valid json. if anything is wrong with it, it will do that.