Wiki stack trace #2

can't read "R": no such variable
    while executing
"armour $R"
    invoked from within
"subst {
	    [<fieldset> login title Login {
		[<text> nickname title "Nickname"]
		[<input> name save type submit value "Login" {}]
	    }]
	    [<hi..."
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 [list subst $body]"
    (class "::FormClass" method "<form>" line 34)
    invoked from within
"<form> login method post action [file join $mount edit/login] {
	    [<fieldset> login title Login {
		[<text> nickname title "Nickname"]
		[<input> n..."
    ("uplevel" body line 4)
    invoked from within
"uplevel 1 subst [list $templates($tname)]"
    (procedure "sendPage" line 8)
    invoked from within
"sendPage $r login"
    (procedure "::WikitWub::/search" line 14)
    invoked from within
"$cmd $rsp {*}$argl {*}$argll"