Laravel 5 Function name must be a string Error

i suddenly got this error message 'Function name must be a string' when i try to read all of my model rows from database.

This is the code, i run when i get the error.

 /**
 * Display a listing of the resource.
 *
 * @return \Illuminate\Http\Response
 */
public function index()
{
    return Customer::all();
}

This is the image of the error.

I don't understand what i could do so i can't run simple query to list all rows from database. Can anyone help me how to fix this ? I have checked all other posts from stackoverflow for this title but i could not find solution.

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