进入到QC的 test plan模块后，点击新增新的目录（New Floder）时候，填写完名字然后保存。这时候就将会提示“failed to create tree node”，并且无法创建新的目录。详细提示如下：
Messages:
Failed to Create Tree Node;
Failed to create new subject '121';
Failed to create new subject with name '121' under father #2;
Stack Trace:
com.mercury.optane.core.CTdException: Failed to create new subject with name '121' under father #2
at com.mercury.td.tdserver.api.logics.CreateSubjectHelper.throwIfTooManyInsertRetries(CreateSubjectHelper.java:170)
at com.mercury.td.tdserver.api.logics.CTreeLogic.throwIfTooManyInsertRetries(CTreeLogic.java:425)
at com.mercury.td.tdserver.api.logics.CTreeLogic.createSubject(CTreeLogic.java:393)
wrapped in com.mercury.optane.core.CTdException: Failed to create new subject '121'
at com.mercury.td.tdserver.api.logics.CTreeLogic.createSubject(CTreeLogic.java:411)
at com.mercury.td.tdserver.api.logics.CTreeLogic.createSubject(CTreeLogic.java:907)
at com.mercury.td.tdserver.requests.CreateTreeNode.execute(CreateTreeNode.java:26)
at com.mercury.optane.core.web.RequestsDispatcher.execute(RequestsDispatcher.java:91)
wrapped in com.mercury.optane.core.CTdException: Failed to Create Tree Node
at com.mercury.optane.core.web.RequestsDispatcher.execute(RequestsDispatcher.java:98)
at com.mercury.td.web.CAbsServlet.executeFunction(CAbsServlet.java:444)
at com.mercury.td.web.CAbsServlet.processRequest(CAbsServlet.java:436)
at com.mercury.td.web.CTdServlet.processRequest(CTdServlet.java:168)
at com.mercury.td.web.CAbsServlet.doPost(CAbsServlet.java:332)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.hp.qc.core.utils.gzipfilter.GZIPFilter.doFilter(GZIPFilter.java:30)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.valves.FastCommonAccessLogValve.invoke(FastCommonAccessLogValve.java:481)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)