< HTTP/1.1 401 Forbidden
< Date: Fri, 08 Oct 2010 09:25:11 GMT
< P3P: policyref="http://info.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE LOC GOV"
< WWW-Authenticate: OAuth oauth_problem=signature_invalid
< Connection: close
< Transfer-Encoding: chunked
< Content-Type: application/x-www-form-urlencoded
* Closing connection #0
Fetching access token failed

Can someone help me with the above response?
I am using Yahoo Messenger API to develop desktop based application in PHP.

Regards
Adi