Config is broken when I use load-user-file

Question

This is my config for org-babel:

(use-package org
  :mode (("\\.org$" . org-mode))
  :ensure org-plus-contrib  
   :config
    (org-babel-do-load-languages 'org-babel-load-languages
                           '((emacs-lisp . t)         
                             (python . t)             
                             (shell . t)              
                             (jupyter . t))))

It works when it is located in my init.el. However when I relocate it in another file org.el and load it in init.el with: (load-user-file "org.el") I have got the error:

Symbol's value as variable is void: org-src-lang-modes

Also I have the line ;;; -*- lexical-binding: t -*- and the same encoding in both files (init.el,org.el). So, could you explain me what happens?

UPDATE.

Just for clarification this is my load-user-file :

(defun load-user-file (file)
  (interactive "f")
  "Load a file in current user's configuration directory"
  (load-file (expand-file-name file user-init-dir)))

Answer 1

The name org.el is a bad name for your file, because it conflicts with the org.el file that is part of Org mode. When emacs is asked to load org.el, which one will be loaded is determined by how emacs's load-path variable is defined, but in any case you will not be able to load both, so either your functionality will be missing or Org mode might be broken.

The solution is to rename your file to a unique name that will not cause a conflict.