An error has occurred

Warning: Constant PAGE_DIR already defined in /home/public/e-bible.app/app/app.php line 92

[1] file: []: handle_error(4)
[2] file: /home/public/e-bible.app/app/app.php[92]: define(2)
[3] file: /home/public/e-bible.app/index.php[29]: require(1)