Build failed in Hudson: River-QA » Ubuntu #2

[Apache Hudson Server <hu...@hudson.apache.org>]

See <https://hudson.apache.org/hudson/job/River-QA/./label=Ubuntu/2/>

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Started by upstream project "River-QA" build number 2
Building remotely on ubuntu2
Updating http://svn.apache.org/repos/asf/incubator/river/jtsk/trunk
At revision 1039898
no change for http://svn.apache.org/repos/asf/incubator/river/jtsk/trunk since the previous build
[Ubuntu] $ ant -Dlabel=Ubuntu diagnostics
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 "<https://hudson.apache.org/hudson/job/River-QA/./label=Ubuntu/ws/")>: java.io.IOException: error=2, No such file or directory
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
	at hudson.Proc$LocalProc.<init>(Proc.java:192)
	at hudson.Proc$LocalProc.<init>(Proc.java:164)
	at hudson.Launcher$LocalLauncher.launch(Launcher.java:638)
	at hudson.Launcher$ProcStarter.start(Launcher.java:273)
	at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:793)
	at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:767)
	at hudson.remoting.UserRequest.perform(UserRequest.java:114)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:270)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
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:453)
	... 15 more
Archiving artifacts