RTC csv Import doesn't create few workitems instead create a default Defect workitem without any summary or description.

 I'm trying to Import few 100 data as csv file into RTC4.0.6. When I tried with 30 data 20 got imported and remaining10 workitems did not get created instead a few Defect (default workitem) got created.
 How to resolve this issue?

Logs -

2015-01-21 11:38:09,068 [http-bio-9445-exec-1680 @@ 11:38 asukuma@us.ibm.com /jazz/service/com.ibm.team.rtc.common.internal.service.web.sprite.ISpriteImageService/js/bundle] ERROR com.ibm.team.rtc.common.service                     - Problems serving sprite image service request
com.ibm.team.repository.common.TeamRepositoryException: Unknown bundle id: bundleentry/382
at com.ibm.team.rtc.common.internal.service.web.sprite.SpriteImageService.buildFromWebBundle(SpriteImageService.java:288)
    at com.ibm.team.rtc.common.internal.service.web.sprite.SpriteImageService.serveBundleRequest(SpriteImageService.java:117)
    at com.ibm.team.rtc.common.internal.service.web.sprite.SpriteImageService.perform_GET(SpriteImageService.java:93)
    at com.ibm.team.repository.service.TeamRawService.service(TeamRawService.java:84)
    at sun.reflect.GeneratedMethodAccessor548.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
    at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
    at com.sun.proxy.$Proxy1752.service(Unknown Source)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.doRestService(AbstractTeamServerServlet.java:909)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:2355)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:2153)
    at com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1963)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
    at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
    at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)
    at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
    at com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:74)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.ibm.team.repository.server.servletbridge.BridgeFilter.processDelegate(BridgeFilter.java:165)
    at com.ibm.team.repository.server.servletbridge.BridgeFilter.doFilter(BridgeFilter.java:198)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:612)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:358)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:761)