Ant not working in Eclipse Kepler (Java Virtual Machine Launcher - A Java Exception has occured)

I recently upgraded to Eclipse Kepler, and am having issues with Ant. I am getting the Java Virtual Machine Launcher - A Java Exception has occurred error no matter which target I choose in my build files. I tried reinstalling my JDK, and I still get the error. I am running the 7u25 version of the JDK. I have my JAVA_HOME environment variable set to `C:\Progra~1\Java\jdk1.7.0_25`, so I don't think this is the problem. What else could be causing the problem? EDIT: I also tested ant in the command line and it works just fine. Is this a bug in Kepler? EDIT 2: Here is the log of the errors: ``` org.eclipse.core.runtime.CoreException: Could not find one or more classes: "org.apache.tools.ant.BuildLogger". Please check the Ant classpath. at org.eclipse.ant.core.AntRunner.problemLoadingClass(AntRunner.java:467) at org.eclipse.ant.core.AntRunner.run(AntRunner.java:380) at org.eclipse.ant.internal.launching.launchConfigurations.AntLaunchDelegate.runInSameVM(AntLaunchDelegate.java:307) at org.eclipse.ant.internal.launching.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:260) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:858) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:707) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:700) at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.launchBuild(ExternalToolBuilder.java:181) at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.doBuildBasedOnScope(ExternalToolBuilder.java:169) at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.build(ExternalToolBuilder.java:88) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295) at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374) at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:514) at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:423) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:830) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:707) at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1018) at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1222) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) Caused by: java.lang.NoClassDefFoundError: org/apache/tools/ant/BuildLogger at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) at java.lang.Class.getConstructor0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at org.eclipse.ant.core.AntRunner.run(AntRunner.java:324) ... 24 more Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.BuildLogger at java.net.URLClassLoader$1.run(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 org.eclipse.ant.internal.core.AntClassLoader.findClass(AntClassLoader.java:54) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 29 more ```