Hotkeys do not work

[Difrex]

Hotkeys do not work after the mode is loaded.

Messages:

Key sequence contains invalid event C-c C-c
Key sequence contains invalid event C-c C-n
Key sequence contains invalid event C-c C-b
Key sequence contains invalid event C-c C-e

Code from idec-mode.el

(defvar idec-mode-map
    (let ((map (make-sparse-keymap)))
        (define-key map ["C-c C-c"] 'kill-this-buffer)
        (define-key map ["C-c C-n"] 'idec-next-message)
        (define-key map ["C-c C-b"] 'idec-previous-message)
        (define-key map ["C-c C-e"] 'idec-new-message)
        map)
    "Keymapping for IDEC mode.")