Minecraft - CloudNet fatal error

I have a big problem with my Minecraft server. On my server CloudNet is installed and when I start the master everything is fine, no error message on PuTTy or other. But when I try to start the Wrapper-1, comes a strange error message (SEE PICTURE). My friend reinstalled CloudNet yesterday and probably made a mistake there, but I have little idea of the matter as it's mostly taking friends from me. But maybe someone can help me.

Thanks for any helpful answer,

LG: Nils

I know that's not a good answer, but it's best to deal with Dytanic. (CloudNet Developer)

The wrapper can't connect to the master. Try to reinstall the wrapper.