My server was offline, so I paid and connected again, but there was a problem.

I’m going to make a new payment and reconnect it. Please let me know what my problem is.
I’m not a developer. I am currently using Linux 7.
Please tell me the details of the command I need to execute.

Hi @Dae_Seong_HA ,

Welcome to the Netdata Forum and thanks for raising your concern with us.

From the error you it seems the node is already connected to Netdata Cloud.
Please follow the instructions on Remove and reconnect a node from here and let us know if you were able to sort it out.

P.S.: I edited your image since you were including the tokens there.