Tomcat error while ant deploy (via manager)

Question

I am getting the following error whenever I deploy or undeploy my jsp application using ant.
The error is :
Jun 30, 2007 1:18:50 PM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.NoClassDefFoundError: org/apache/tomcat/util/buf/ByteChunk
     at org.apache.catalina.util.Base64.decode(Base64.java:214)
     at org.apache.catalina.authenticator.BasicAuthenticator.authenticate(BasicAuthenticator.java:165)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:491)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
     at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
     at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
     at java.lang.Thread.run(Thread.java:595)
The ant call I used for accessing tomcat manager:
     <target name="start">
          <start
               path="/${application.name}"
               url="${manager.url}"
               username="${manager.id}"
               password="${manager.password}"
          />
     </target>
Id and passwords seem to be correct, I get the error above, however my application is deployed and there is no problem other than the annoying exception
Thanks...

Answer 1

But as of now we cannot change application. So is there any temporary solution to fix the issue.
FYI
   I went through the BO samples Adding Report.jsp. Not helping for current scenario.
Regards
lnarayanan