Create an issue of type "Task", assign it to "somebody".
Ask "somebody" to "Start Progress".

Try to reassign task.

see below...

Cause:

Referer URL: https://intranet.valtech.de/vita/secure/AssignIssue!default.jspa?id=17891

Build Information:
Uptime: N/A
Edition: Professional
Version: 3.0
Build Number: 72

Server Information:
Application Server: Apache Tomcat/4.1.29
Servlet Version: 2.3

Memory Information:
Total Memory: 140 MB
Free Memory: 26 MB
Used Memory: 114 MB

System Information:
System Date: Montag, 18 Okt 2004
System Time: 12:56:41
Java Version: 1.4.2_04
Java Vendor: Sun Microsystems Inc.
JVM Version: 1.0
JVM Vendor: Sun Microsystems Inc.
JVM Implementation Version: 1.4.2_04-b05
Java Runtime: Java(TM) 2 Runtime Environment, Standard Edition
Java VM: Java HotSpot(TM) Client VM
User Name: jira3
User Timezone: Europe/Berlin
User Locale: Deutsch (Deutschland)
System Encoding: UTF-8
Operating System: Linux 2.4.21-15.0.2.ELsmp
OS Architecture: i386
Application Server Container:
Database type: postgres
Database JNDI address: java:comp/env/jdbc/JiraDS

Request Information:
Request URL: https://intranet.valtech.de/vita/secure/AssignIssue.jspa

• Scheme: https
• Server: intranet.valtech.de
• Port: 443
• URI: /vita/500page.jsp
• - Context Path: /vita
• - Servlet Path: /500page.jsp
• - Path Info: null
• - Query String: null
  Request Attributes:
• javax.servlet.error.message : There we errors stopping progress on the issue. Please see log for more details.<p><small><small><pre>java.lang.IllegalStateException: There we errors stopping progress on the issue. Please see log for more details. at com.atlassian.jira.issue.AssignIssueUtilsImpl.stopProgressIfInProgress(AssignIssueUtilsImpl.java:61) at com.atlassian.jira.issue.AssignIssueUtilsImpl.assignIssue(AssignIssueUtilsImpl.java:99) at com.atlassian.jira.web.action.issue.AssignIssue.doExecute(AssignIssue.java:97) at webwork.action.ActionSupport.execute(ActionSupport.java:151) at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:46) at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:131) at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:186) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:142) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:58) at com.atlassian.jira.web.filters.SitemeshExcludePathFilter.doFilter(SitemeshExcludePathFilter.java:36) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:168) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:181) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132) at com.atlassian.jira.web.filters.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:25) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.jira.web.filters.ActionCleanupDelayFilter.doFilter(ActionCleanupDelayFilter.java:37) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:91) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.jira.web.filters.gzip.GzipFilter.doFilter(GzipFilter.java:72) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at edu.yale.its.tp.cas.client.filter.CASFilter.doFilter(CASFilter.java:156) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:36) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2417) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193) at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:309) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:387) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:673) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:615) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:786) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666) at java.lang.Thread.run(Thread.java:534) </pre></small></small></p>
• os_securityfilter_already_filtered : true
• _sitemesh_using_stream : false
• com.atlassian.jira.web.filters.ActionCleanupDelayFilter : true
• com.atlassian.johnson.filters.JohnsonFilter_already_filtered : true
• javax.servlet.error.request_uri : /vita/secure/AssignIssue.jspa
• jira.webwork.generic.dispatcher : webwork.dispatcher.GenericDispatcher@b5c214
• javax.servlet.error.status_code : 500
• _sitemesh_filterapplied : true
• jira.webwork.cleanup : false
• javax.servlet.error.servlet_name : action
• com.atlassian.jira.web.filters.gzip.GzipFilter_already_filtered : true
• loginfilter.already.filtered : true
• atlassian.core.seraph.original.url : /secure/AssignIssue.jspa
• webwork.result : Value stack =========== ===========