I have upgraded testlink from 1.9.3 to 1.9.6, then the jenkins testlink plugin doesn't work any more. The error reported by the plugin is:

Preparing TestLink client API.
Using TestLink URL: http://192.168.1.24/testlink-1.9.6/lib/api/xmlrpc.php

FATAL: java.lang.Boolean cannot be cast to java.util.Map
java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.util.Map
at br.eti.kinoshita.testlinkjavaapi.util.Util.castToMap(Util.java:586)
at br.eti.kinoshita.testlinkjavaapi.TestProjectService.getTestProjectByName(TestProjectService.java:115)
at br.eti.kinoshita.testlinkjavaapi.TestLinkAPI.getTestProjectByName(TestLinkAPI.java:438)
at hudson.plugins.testlink.TestLinkBuilder.getTestLinkSite(TestLinkBuilder.java:255)
at hudson.plugins.testlink.TestLinkBuilder.perform(TestLinkBuilder.java:140)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:804)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:586)
at hudson.model.Run.execute(Run.java:1575)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:241)