[gambit-list] Newbie: define-macro question

I'm rather new to Lisp & Scheme (< 3 months total exposure) but I'm trying to make a real effort to learn the language. I'm delving into macros and having a problem understanding the basics. I've defined a macro called print-line like so: (define-macro (print-line msg) (list `(display ,msg) `(newline))) When I try to use the macro from the repl I get the error message: (print-line "hi") hi ***ERROR in (console)@38.1 -- Operator is not a PROCEDURE I do see the output I expect prior to the error so something is partially working. I'm certain that the problem is caused by my flawed understanding of how macros work. Could someone with more scheme-fu shed light on what/where the problem is? Thanks, Kevin