AccessToken error while sharing the content with twitter

AccessToken error while sharing the content with twitter

Guys Iam trying to share the content into Twitter but unfortunately Iam
getting an error related to the Access
Token..ie(AccessToken{screenName='null', userId=0})....I have posted the
whole logcat output below..plz refer it and suggest me what to do ahead..?
Logcat
08-28 13:36:36.238: D/kiran-> token(1906):
1685102257-7K2lwqoBlgi1xifnZGOoWbZPLAHHVyNFlLwW6iZ
08-28 13:36:36.238: D/kiran-> secret(1906):
uwiU8L2TdXBLV4TJAmIW9vWcCPi5QeiFFiDdbJ9bQzs
08-28 13:36:36.270: D/acc_token :(1906): AccessToken{screenName='null',
userId=0}
08-28 13:36:36.620: D/dalvikvm(1906): GC_CONCURRENT freed 999K, 55% free
3076K/6727K, external 1625K/2137K, paused 6ms+7ms
08-28 13:36:36.909: D/error dj-->(1906): While trying to retrieve the URL:
08-28 13:36:36.909: D/error dj-->(1906): <A
HREF="http://api.twitter.com/1/statuses/update.json">http://api.twitter.com/1/statuses/update.json</A>
08-28 13:36:36.909: D/error dj-->(1906): <P>
08-28 13:36:36.909: D/error dj-->(1906): The following error was encountered:
08-28 13:36:36.909: D/error dj-->(1906): <UL>
08-28 13:36:36.909: D/error dj-->(1906): <LI>
08-28 13:36:36.909: D/error dj-->(1906): <STRONG>
08-28 13:36:36.909: D/error dj-->(1906): Access Denied.
08-28 13:36:36.909: D/error dj-->(1906): </STRONG>
08-28 13:36:36.909: D/error dj-->(1906): <P>
08-28 13:36:36.909: D/error dj-->(1906): </UL>
08-28 13:36:36.909: D/error dj-->(1906): <P>Your cache administrator is <A
HREF="mailto:admin@localhost">admin@localhost</A>.
08-28 13:36:36.909: D/error dj-->(1906): <BR clear="all">
08-28 13:36:36.909: D/error dj-->(1906): <HR noshade size="1px">
08-28 13:36:36.909: D/error dj-->(1906): <ADDRESS>