Build failed using CruiseControl and ClearCase Snapshot view

As shown below, I got CruiseControl error message for snapshot ClearCase
build, I attach my config.xml for your review. I am first time CruiseControl
user, do I need any special configuration or plugin for ClearCase ?
Please help, Ha 
---------------- 
[cc]Mar-17 18:00:14 Project       - Project cc_HIAL_Adaptor:  bootstrapping 
[cc]Mar-17 18:00:14 jectController- cc_HIAL_Adaptor Controller: build
progress event: bootstrapping 
[cc]Mar-17 18:00:14 Project       - Project cc_HIAL_Adaptor:  idle 
[cc]Mar-17 18:00:14 jectController- cc_HIAL_Adaptor Controller: build
progress event: idle 
[cc]Mar-17 18:00:14 Project       - exception attempting build in project
cc_HIAL_Adaptor 
net.sourceforge.cruisecontrol.CruiseControlException: cleartool failed with
exception 
        at
net.sourceforge.cruisecontrol.util.CommandExecutor.executeAndWait(CommandExecutor.java:115) 
        at
net.sourceforge.cruisecontrol.util.Commandline.executeAndWait(Commandline.java:617) 
        at
net.sourceforge.cruisecontrol.bootstrappers.ClearCaseBootstrapper.bootstrap(ClearCaseBootstrapper.java:72) 
        at net.sourceforge.cruisecontrol.Project.bootstrap(Project.java:760) 
        at net.sourceforge.cruisecontrol.Project.build(Project.java:192) 
        at net.sourceforge.cruisecontrol.Project.execute(Project.java:147) 
        at
net.sourceforge.cruisecontrol.ProjectConfig.execute(ProjectConfig.java:402) 
        at
net.sourceforge.cruisecontrol.ProjectWrapper.run(ProjectWrapper.java:69) 
        at java.lang.Thread.run(Thread.java:595) 
Caused by: java.io.IOException: java.io.IOException: cleartool: not found 
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:148) 
        at java.lang.ProcessImpl.start(ProcessImpl.java:65) 
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:451) 
        at java.lang.Runtime.exec(Runtime.java:591) 
        at java.lang.Runtime.exec(Runtime.java:464) 
        at
net.sourceforge.cruisecontrol.util.CruiseRuntime.exec(CruiseRuntime.java:14) 
        at
net.sourceforge.cruisecontrol.util.Commandline.execute(Commandline.java:591) 
        at
net.sourceforge.cruisecontrol.util.CommandExecutor.executeAndWait(CommandExecutor.java:113) 
        ... 8 more 
http://www.nabble.com/file/p22601087/config.xml config.xml 
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