my yappari is not working. suddenly its stopped. its asking again and again for register... kindly help to resolve.

Please find the logs:

Jan 25 00:45:58 2015
<failure>
xmlns=urn:ietfarams:xml:ns:xmpp-sasl
<not-authorized>

Login failed
connected(): There was a Login Exception: Login failed
Connection closed.
Stopping timers.
Freeing up the connection.
Freeing up the socket.
Registration started
Country code: IN
reg/req/exists/start
Request: https://v.whatsapp.net/v2/exist?cc=9...460014421c9044
HttpRequest(): Connecting to v.whatsapp.net:443
HttpRequest(): Sending request...
HttpRequest(): Waiting for response...
HttpRequest(): Got response
HTTP/1.1 200 OK
Connection: close
Server: Yaws 1.94
Date: Sat, 24 Jan 2015 19:16:19 GMT
Content-Length: 71
Content-Type: text/json ; charset=utf-8

HttpRequest(): All headers read. Available: 71
Reply: {"status":"fail","reason":"incorrect","sms_length" :6,"voice_length":6}

reg/req/exists/fail
User 918861348143 is not registered.
reg/req/sms/start
Request: https://v.whatsapp.net/v2/code?cc=91...460014421c9044
HttpRequest(): Connecting to v.whatsapp.net:443
HttpRequest(): Sending request...
HttpRequest(): Waiting for response...
HttpRequest(): Got response
HTTP/1.1 200 OK
Connection: close
Server: Yaws 1.94
Date: Sat, 24 Jan 2015 19:16:22 GMT
Content-Length: 39
Content-Type: text/json ; charset=utf-8

HttpRequest(): All headers read. Available: 39
Reply: {"status":"fail","reason":"bad_token"}

reg/req/sms/fail
reg/req/voice/start
Request: https://v.whatsapp.net/v2/code?cc=91...460014421c9044
HttpRequest(): Connecting to v.whatsapp.net:443
HttpRequest(): Sending request...
HttpRequest(): Waiting for response...
HttpRequest(): Got response
HTTP/1.1 200 OK
Connection: close
Server: Yaws 1.94
Date: Sat, 24 Jan 2015 19:16:29 GMT
Content-Length: 39
Content-Type: text/json ; charset=utf-8

HttpRequest(): All headers read. Available: 39
Reply: {"status":"fail","reason":"bad_token"}

reg/req/voice/fail
HttpRequestv2() Socket Error 1