TokenResponseException when using Xing Auth

[Mahfuzur rahman]

After getting ?oauth_token=dc6659cd257e0547cc58&oauth_verifier=3008
when calling this $xing->requestAccessToken($token, $verify);
getting this error.
'OAuth\Common\Http\Exception\TokenResponseException' with message 'Failed to request resource

but working fine with facebook,twitter,g+ and linkedin