use command “cordova plugin add jxcore-cordova/io.jxcore.node/”,
I get this error message: “Error: Cannot find plugin.xml for plugin "io.jxcore.node". Please try adding it again.”

I was referring to the https://modernweb.com/2015/03/19/develop-an-ios-application-with-node-js-and-cordova/ operation.
How can I solve this problem?