May 25, 2016 10:05:38 AM hudson.ExpressionFactory2$JexlExpression evaluate
WARNING: Caught exception evaluating: d.helpFile in /view/Misc/job/Node-Keep-Alive/configure. Reason: java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor136.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.commons.jexl.util.PropertyExecutor.execute(PropertyExecutor.java:125)
        at org.apache.commons.jexl.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:314)


Caused by: java.lang.NoClassDefFoundError: hudson/tasks/Ant
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2625)
        at java.lang.Class.getDeclaredMethods(Class.java:1868)
        at org.kohsuke.stapler.ClassDescriptor.findMethods(ClassDescriptor.java:148)
        at org.kohsuke.stapler.ClassDescriptor.<init>(ClassDescriptor.java:84)
        at org.kohsuke.stapler.MetaClass.buildDispatchers(MetaClass.java:106)
        at org.kohsuke.stapler.MetaClass.<init>(MetaClass.java:94)
        at org.kohsuke.stapler.WebApp.getMetaClass(WebApp.java:203)
        at org.kohsuke.stapler.jelly.groovy.GroovyFacet.createRequestDispatcher(GroovyFacet.java:106)
        at org.kohsuke.stapler.RequestImpl.getView(RequestImpl.java:257)
        at org.kohsuke.stapler.RequestImpl.getView(RequestImpl.java:252)
        at hudson.model.Descriptor.getHelpFile(Descriptor.java:742)
        at hudson.model.Descriptor.getHelpFile(Descriptor.java:724)
        at hudson.model.Descriptor.getHelpFile(Descriptor.java:713)
        ... 167 more
Caused by: java.lang.ClassNotFoundException: hudson.tasks.Ant
        at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1376)
        at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
        at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 181 more