Android:Email: E/AbstractSyncService( 529): java.lang.NullPointerException occurs every time

I am working on Active sync in Androi开发者_运维知识库d. I get "java.lang.NullPointerException" every time.

Logs shows:

Uncaught exception in EasSyncService 
java.lang.NullPointerException
 org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:453)
 at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
 at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
 at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
 at com.android.exchange.EasSyncService.sendHttpClientPost(EasSyncService.java:787)
 at com.android.exchange.EasSyncService.sendPing(EasSyncService.java:721)
 at com.android.exchange.EasSyncService.runPingLoop(EasSyncService.java:1093)
 at com.android.exchange.EasSyncService.runAccountMailbox(EasSyncService.java:957)
 at com.android.exchange.EasSyncService.run(EasSyncService.java:1460)
 at java.lang.Thread.run(Thread.java:1096)

This error has been noticed in logs when I am sending http request using POST. Sending the ping command gives the above error some times.

I am not able to figure out why this error occurs and how it can be avoided . Kindly any one can give solution to above and solve the same .

Solution is appreciated well in advance.

The traceback looks similar to http://code.google.com/p/android/issues/detail?id=5255 .