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ERROR: Undefined property: DI\\Container::$course on line 19 in file /Users/princeraj/php_rest_api/app/routes.php."

I got this error when I opened my local host, btw my files are different eg. your src folder is my App folder and I even don't need to add autoload , it was already there. as I am watching this lecture after a year. could you please help me to figure it out, what's caused the error.