Don't work c# server

hello, I created a server in c # uploaded to the site and when I try to start it displays an error

error MSB3644: The reference assemblies for .NETFramework,Version=v4.7.2 were not found.

Hey @barbossik welcome to the forums!

Can you elaborate on what you are asking help for? Can you provide a link to your Repl?

i want run this server

@barbossik run what server? Can you post a link to your Repl?