iApp question

This is because you're trying to add the new node. You need to have a question whether to create a new pool or use an existing one. I use the following for my question section:

choice pool display "xxlarge" default "/create_new" tcl {
                    package require iapp 1.1.0
                    return "Create a new pool\t/create_new\n[iapp::get_items ltm pool]"
                }
                optional ( pool == "/create_new" ) {
                     Build a table of pool members
                    choice lb_method default "least-connections-member" display "xxlarge"

                    choice monitor display "xxlarge" default "/create_new" tcl {
                        package require iapp 1.1.0
                        set choices "Create a new health monitor\t/create_new\n[iapp::get_items ltm monitor http]\n[iapp::get_items ltm monitor https]\n[iapp::get_items -filter NAME != "external" ltm monitor external]"
                        return $choices
                    }
                    optional ( monitor == "/create_new" ) {
                        string uri default "/"
                        choice http_version display "xxlarge" default "http11"
                        optional ( http_version == "http11" ) {
                            string host required display "large" validator "FQDN"
                        }
                        string response display "xxlarge" default "200 OK"
                    }
                    table pool_members {
                        editchoice addr display "large" tcl {
                            package require iapp 1.1.0
                            return [iapp::get_items ltm node]
                        }
                        string port display "small" required default "80" validator "PortNumber"
                    }
                }