getting err_too_many_redirects in laravel when I use Request for validation for validating unique

it is my error page

I have used customize Request page for geting value from post request.

in that request I am validation

namespace App\Http\Requests;

use App\Http\Requests\Request;

class TaxclassRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            "tax_class"=>'unique:taxes,tax_class'
        ];
    }
}

and my controller is

    function insert(TaxclassRequest $request)
    {



                $n=$request->input('number');           //total number of variable that has been created dyanamic
                $tax_class=$request->input("tax_class"); // tax_class
.
.
.
other code

I am getting error ERR_TOO_MANY_REDIRECTS

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