Hi Juan,

Juan Queipo de Llano Moya <jqueipo@ietcc.csic.es> writes:

If I define a custom agenda command like (without using the command):
("q" "Tasks by member" ((tags-todo "+Resp=\"Me\"") (tags-todo "+Resp=
\"Pablo\"") (tags-todo "+Resp=\"Miguel\"") (tags-todo "+Resp=\"Carlos
\"")))

It works, but if use this agenda command:
("q" "Tasks by member" (org-sec-tasksbymember))
I got an error of Wrong type argument: listp, org-sec-tasksbymember

You want

(setq org-agenda-custom-commands
  `(("q" 
     "Tasks by member" 
     ,(org-sec-tasksbymember))))

Look for Macro expansion in the Emacs (lisp) manual.

HTH,