Build failed in Hudson: Maven-2.1-with-bootstrap #2

[Hudson]

See http://ci.sonatype.org/job/Maven-2.1-with-bootstrap/2/changes

------------------------------------------
started
Updating https://svn.apache.org/repos/asf/maven/components/trunk
At revision 648312
no change for https://svn.apache.org/repos/asf/maven/components/trunk since the 
previous build
[trunk] $ ant
FATAL: command execution failed.Maybe you need to configure the job to choose 
one of your Ant installations?
java.io.IOException: Cannot run program "ant" (in directory 
"http://ci.sonatype.org/job/Maven-2.1-with-bootstrap/ws/trunk";) : 
java.io.IOException: error=2, No such file or directory
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
        at hudson.Proc$LocalProc.<init>(Proc.java:104)
        at hudson.Proc$LocalProc.<init>(Proc.java:82)
        at hudson.Launcher$LocalLauncher.createLocalProc(Launcher.java:291)
        at hudson.Launcher$LocalLauncher.launch(Launcher.java:282)
        at hudson.Launcher.launch(Launcher.java:120)
        at hudson.Launcher.launch(Launcher.java:72)
        at hudson.tasks.Ant.perform(Ant.java:179)
        at hudson.model.Build$RunnerImpl.build(Build.java:146)
        at hudson.model.Build$RunnerImpl.doRun(Build.java:122)
        at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:224)
        at hudson.model.Run.run(Run.java:749)
        at hudson.model.Build.run(Build.java:102)
        at hudson.model.ResourceController.execute(ResourceController.java:70)
        at hudson.model.Executor.run(Executor.java:71)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or 
directory
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
        at java.lang.ProcessImpl.start(ProcessImpl.java:65)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:452)
        ... 14 more