When i post form angular form to API Laravel i get error 500 (Internal Server Error) in console .... why?

Note: Backend API is working perfectly with POSTMAN.

My Cors.php in Laravel is:

namespace App\Http\Middle ware;

use Closure;

class Cors
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Htt p\Request $request
* @param...