My gradle build works fine when I do it via the command prompt. While doing it via Jenkins, I get the following error:
Started by user anonymous
Building in workspace /var/lib/jenkins/jobs/unite/workspace
[Gradle] - Launching build.
[workspace] $ gradle build -b /run/media/navin/Data/GitRepositories/unite/build.gradle
FATAL: command execution failed
java.io.IOException: Cannot run program "gradle" (in directory "/var/lib/jenkins/jobs/unite/workspace"): error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041)
at hudson.Proc$LocalProc.<init>(Proc.java:244)
at hudson.Proc$LocalProc.<init>(Proc.java:216)
at hudson.Launcher$LocalLauncher.launch(Launcher.java:773)
at hudson.Launcher$ProcStarter.start(Launcher.java:353)
at hudson.Launcher$ProcStarter.join(Launcher.java:360)
at hudson.plugins.gradle.Gradle.performTask(Gradle.java:236)
at hudson.plugins.gradle.Gradle.perform(Gradle.java:118)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:784)
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:565)
at hudson.model.Run.execute(Run.java:1670)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:135)
at java.lang.ProcessImpl.start(ProcessImpl.java:130)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1022)
... 16 more
Build step 'Invoke Gradle script' changed build result to FAILURE
Build step 'Invoke Gradle script' marked build as failure
Collecting metadata...
Metadata collection done.
Finished: FAILURE

Google searching showed the error could be because of not selecting the Gradle version http://stackoverflow.com/questions/8646762/cannot-run-program-gradle-in-jenkins

But when I click the dropdown menu to select the Gradle version, there is no version number shown at all. There's just "Default".
I'm using version 1.23 of the Gradle plugin, Firefox version 25, using Jenkins.war and starting it as sudo service jenkins start on localhost:8080. Using jdk1.7.0_45. This is my first install of Jenkins.