Hash check failed. Key file seems to be corrupted. (0)

[khoavm]

Help me this is my code. key file same folder with index.php """"""""""""

require 'vendor/autoload.php'; use baibaratsky\WebMoney\Signer;

Flight::route('/', function(){ $test = file_get_contents('test.kwm'); $signer = new Signer('wmid', $test, '12345678'); $data = 'Data to be signed'; $signature = $signer->sign($data); echo "hello world! $signature"; });

Flight::start();