This error means that Agile Server is trying to resume a corrupt session. To clear the corrupt session, the Work subdirectory in the CATALINA_HOME has to be renamed. By default is located in,
C:\Program Files\Borland\StarTeam Agile 2.0\apache-tomcat-7.0.47
This will recreate the file structure of the Work subdirectory in the CATALINA_HOME and will clean any temporary session data generated.