Can not make clearantlib worked

I have a simple build.xml file, but I can not make it worked with
clearantlib. 
build.xml is used in config.xml. Please help. 
Ha
Below is the listing of build.xml and error encounterred: 
------ 
build.xml listing: 
 
<project name="ccant" basedir="." default="cc-tasks"
xmlns:ca="antlib:net.sourceforge.clearantlib"> 
 
<target name="cc-tasks">  
<!-- remove the label type--> <ca:ccexec failonerror="true"> <arg
value="describe"/> <arg line="-short"/> <arg
value="C:\ccweb_ha15747\ha15747_ProjetHL7\CVOB_DSEI\HL7IntegrationDriver\CommonPlatform"/>
</ca:ccexec>  
 
</target> 
</project> 
 
------ 
error encounterred: 
 
C:\ccweb_ha15747\ha15747_ProjetHL7\CVOB_DSEI>ant 
Buildfile: build.xml 
 
cc-tasks: 
 
BUILD FAILED 
java.lang.UnsupportedClassVersionError:
net/sourceforge/clearantlib/ClearToolApp 
ly (Unsupported major.minor version 49.0) 
at java.lang.ClassLoader.defineClass0(Native Method) 
at java.lang.ClassLoader.defineClass(Unknown Source) 
at java.security.SecureClassLoader.defineClass(Unknown Source) 
at java.net.URLClassLoader.defineClass(Unknown Source) 
at java.net.URLClassLoader.access$100(Unknown Source) 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.net.URLClassLoader.findClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at org.apache.tools.ant.AntClassLoader.findBaseClass(AntClassLoader.java 
:1425) 
at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:108 
4) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClassInternal(Unknown Source) 
at java.lang.Class.forName0(Native Method) 
at java.lang.Class.forName(Unknown Source) 
at org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:583) 
 
at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:228) 
at org.apache.tools.ant.taskdefs.Antlib.execute(Antlib.java:161) 
at org.apache.tools.ant.taskdefs.Definer.loadAntlib(Definer.java:432) 
at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:281) 
at org.apache.tools.ant.ComponentHelper.checkNamespace(ComponentHelper.j 
ava:790) 
at org.apache.tools.ant.ComponentHelper.getDefinition(ComponentHelper.ja 
va:260) 
at org.apache.tools.ant.ComponentHelper.createComponent(ComponentHelper. 
java:237) 
at org.apache.tools.ant.ComponentHelper.createComponent(ComponentHelper. 
java:216) 
at org.apache.tools.ant.UnknownElement.makeObject(UnknownElement.java:41 
4) 
at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.jav 
a:160) 
at org.apache.tools.ant.Task.perform(Task.java:347) 
at org.apache.tools.ant.Target.execute(Target.java:357) 
at org.apache.tools.ant.Target.performTasks(Target.java:385) 
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) 
at org.apache.tools.ant.Project.executeTarget(Project.java:1306) 
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExe 
cutor.java:41) 
at org.apache.tools.ant.Project.executeTargets(Project.java:1189) 
at org.apache.tools.ant.Main.runBuild(Main.java:758) 
at org.apache.tools.ant.Main.startAnt(Main.java:217) 
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) 
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104) 
 
Total time: 0 seconds 

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