how to handle wrong username or password in smack4.1

Hi all,

I am using smack4.1 for android chat app.

I am getting below exception when i using wrong username or password.

Exception:

04-30 08:16:11.941: W/System.err(2149): org.jivesoftware.smack.sasl.SASLErrorException: SASLError using DIGEST-MD5: not-authorized

04-30 08:16:11.971: W/System.err(2149):     at org.jivesoftware.smack.SASLAuthentication.authenticationFailed(SASLAuthenticati on.java:365)

04-30 08:16:11.971: W/System.err(2149):     at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPC onnection.java:1033)

04-30 08:16:11.971: W/System.err(2149):     at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$200(XMPPTCPCon nection.java:937)

04-30 08:16:11.971: W/System.err(2149):     at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnecti on.java:952)

04-30 08:16:11.971: W/System.err(2149):     at java.lang.Thread.run(Thread.java:841)

After getting this error, i am unable loggin event using the correct username and password.

Please help me how to handle it.

Thanks in advance...