at bitel.billing.server.contract.bean.ContractModuleManager.deleteContractModule(ContractModuleManager.java:128)
   at bitel.billing.server.contract.action.ActionContractModuleDelete.doAction(ActionContractModuleDelete.java:25)
   at bitel.billing.server.Executer.doModule(Unknown Source)
   at bitel.billing.server.Executer$1.run(Unknown Source)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.security.auth.Subject.doAs(Subject.java:396)
   at bitel.billing.server.Executer.doPost(Unknown Source)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
   at bitel.billing.server.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:48)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
   at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:301)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:162)
   at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
   at java.lang.Thread.run(Thread.java:619)