Unable to authorize access because the client configuration is invalid: invalid_request

Hi 

we have got a trial account with above email id for testing api for sending for e-sign.
we are now trying code for getting oauthorization code for api.
following are code lines of php code.
we have installed code on
page :http://www.globanx.net/adobesign.php.

<?php
ob_start();
$uniquestring=md5(uniqid(rand(), true));
header("location:https://secure.na1.adobesign.com/public/oauth?redirect_uri=https://www.globanx.net/adobesign.php&response_type=code&client_id=CBJCHBCAABAA354sn7zEhyUv3Lw_mxHFDpPd0tib9UTx&scope=user_login:self+agreement_send:account");
if (isset($_POST['code']))
{
echo $_POST['code'];
}

?>

but we get error saying "Unable to authorize access because the client configuration is invalid: invalid_request".

Please check above and send us correct code and configuration.

Thank you.

Raj Sah.