PHP

laravel select error

 $this->validate($request, [
            'First_Name'    => 'required',
            'Last_Name'     => 'required',
            'Email'         => 'required',
            'Phone'         => 'required',
            'Fax'                        ,
            'Company'                    ,
            'Marketplace'   => 'required',
            'Order_Number'  => 'required',
            'Address_1'     => 'required',
            'Address_2'                  ,
            'City'          => 'required',
            'State'         => 'required',
            'Zip_Code'      => 'required',
            'Test'          => 'required',
            'Product_Name'  => 'required',
            'Quantity'      => 'required',
            'SKU'           => 'required',
        ]);