I'm no lisp expert, but I have attempted to indent the backtrace below for easier reading.
Debugger entered--Lisp error: (error "Capture abort: (wrong-type-argument stringp (file:~/org/todo.org::*Tasks Tasks))") signal(error ("Capture abort: (wrong-type-argument stringp (file:~/org/todo.org::*Tasks Tasks))")) error("Capture abort: %s" (wrong-type-argument stringp ("file:~/org/todo.org::*Tasks" "Tasks"))) (condition-case error (org-capture-put :template (org-capture-fill-template)) ((error quit) (if (get-buffer "*Capture*") (kill-buffer "*Capture*")) (error "Capture abort: %s" error))) (cond ((equal entry "C") (customize-variable (quote org-capture-templates))) ((equal entry "q") (error "Abort")) (t (org-capture-set-plist entry) (org-capture-get-template) (org-capture-put :original-buffer orig-buf :original-file (or (buffer-file-name orig-buf) (and (featurep (quote dired)) (car (rassq orig-buf dired-buffers)))) :original-file-nondirectory (and (buffer-file-name orig-buf) (file-name-nondirectory (buffer-file-name orig-buf))) :annotation annotation :initial initial :return-to-wconf (current-window-configuration) :default-time (or org-overriding-default-time (org-current-time))$) (org-capture-set-target-location) (condition-case error (org-capture-put :template (org-capture-fill-template)) ((error quit) (if (get-buffer "*Capture*") (kill-buffer "*Capture*")) (error "Capture abort: %s" error))) (setq org-capture-clock-keep (org-capture-get :clock-keep)) (if (equal goto 0) (org-capture-insert-template-here) (condition-case error (org-capture-place-template (equal (car (org-capture-get :target)) (quote function))) ((error quit) (if (and (buffer-base-buffer ...) (string-match "\\`CAPTURE-" ...)) (kill-buffer (current-buffer))) (set-window-configuration (org-capture-get :return-to-wconf)) (error "Capture template `%s': %s" (org-capture-get :key) (nth 1 error)))) (if (and (derived-mode-p (quote org-mode)) (org-capture-get :clock-in)) (condition-case nil (progn (if (org-clock-is-active) (org-capture-put :interrupted-clock...)) (org-clock-in) (org-set-local (quote org-capture-clock-was-started) t)) (error "Could not start the clock in this capture buffer"))) (if (org-capture-get :immediate-finish) (org-capture-finalize))))) (let* ((orig-buf (current-buffer)) (annotation (if (and (boundp (quote org-capture-link-is-already-stored)) org-capture-link-is-already-stored) (plist-get org-store-link-plist :annotation) (condition-case nil (progn (org-store-link nil)) (error nil)))) (entry (or org-capture-entry (org-capture-select-template keys))) initial) (setq initial (or org-capture-initial (and (org-region-active-p) (buffer-substring (point) (mark))))) (if (stringp initial) (progn (remove-text-properties 0 (length initial) (quote (read-only t)) initial))) (if (stringp annotation) (progn (remove-text-properties 0 (length annotation) (quote (read-only t)) annotation))) (cond ((equal entry "C") (customize-variable (quote org-capture-templates))) ((equal entry "q") (error "Abort")) (t (org-capture-set-plist entry) (org-capture-get-template) (org-capture-put :original-buffer orig-buf :original-file (or (buffer-file-name orig-buf) (and (featurep (quote dired)) (car (rassq orig-buf dired-buffers)))) :original-file-nondirectory (and (buffer-file-name orig-buf) (file-name-nondirectory (buffer-file-name orig-buf))) :annotation annotation :initial initial :return-to-wconf (current-window-configuration) :default-time (or org-overriding-default-time (org-current-time))) (org-capture-set-target-location) (condition-case error (org-capture-put :template (org-capture-fill-template)) ((error quit) (if (get-buffer "*Capture*") (kill-buffer "*Capture*")) (error "Capture abort: %s" error))) (setq org-capture-clock-keep (org-capture-get :clock-keep)) (if (equal goto 0) (org-capture-insert-template-here) (condition-case error (org-capture-place-template (equal (car ...) (quote function))) ((error quit) (if (and ... ...) (kill-buffer ...)) (set-window-configuration (org-capture-get :return-to-wconf)) (error "Capture template `%s': %s" (org-capture-get :key) (nth 1 error)))) (if (and (derived-mode-p (quote org-mode)) (org-capture-get :clock-in)) (condition-case nil (progn (if ... ...) (org-clock-in) (org-set-local ... t)) (error "Could not start the clock in this capture buffer"))) (if (org-capture-get :immediate-finish) (org-capture-finalize)))))) (cond ((equal goto (quote (4))) (org-capture-goto-target)) ((equal goto (quote (16))) (org-capture-goto-last-stored)) (t (let* ((orig-buf (current-buffer)) (annotation (if (and (boundp ...) org-capture-link-is-already-stored) (plist-get org-store-link-plist :annotation) (condition-case nil (progn ...) (error nil)))) (entry (or org-capture-entry (org-capture-select-template keys))) initial) (setq initial (or org-capture-initial (and (org-region-active-p) (buffer-substring (point) (mark))))) (if (stringp initial) (progn (remove-text-properties 0 (length initial) (quote (read-only t)) initial))) (if (stringp annotation) (progn (remove-text-properties 0 (length annotation) (quote (read-only t)) annotation))) (cond ((equal entry "C") (customize-variable (quote org-capture-templates))) ((equal entry "q") (error "Abort")) (t (org-capture-set-plist entry) (org-capture-get-template) (org-capture-put :original-buffer orig-buf :original-file (or (buffer-file-name orig-buf) (and ... ...)) :original-file-nondirectory (and (buffer-file-name orig-buf) (file-name-nondirectory ...)) :annotation annotation :initial initial :return-to-wconf (current-window-configuration) :default-time (or org-overriding-default-time (org-current-time))) (org-capture-set-target-location) (condition-case error (org-capture-put :template (org-capture-fill-template)) ((error quit) (if ... ...) (error "Capture abort: %s" error))) (setq org-capture-clock-keep (org-capture-get :clock-keep)) (if (equal goto 0) (org-capture-insert-template-here) (condition-case error (org-capture-place-template ...) (... ... ... ...)) (if (and ... ...) (condition-case nil ... ...)) (if (org-capture-get :immediate-finish) (org-capture-finalize)))))))) org-capture(nil) call-interactively(org-capture nil nil) command-execute(jj record) execute-extended-command(nil "jj") call-interactively(execute-extended-command nil nil)