I noticed the following exception in the server log file. I am running the
latest (1.67) version of Hudson:

java.lang.NullPointerException
at hudson.Functions.isAutoRefresh(Functions.java:244)
at hudson.Functions.configureAutoRefresh(Functions.java:224)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.commons.jexl.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:255)
at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:104)
at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:82)
at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:56)
at
org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:50)
at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:79)
at
org.apache.commons.jelly.expression.jexl.JexlExpression.evaluate(JexlExpression.java:69)
at org.apache.commons.jelly.tags.core.SetTag.doTag(SetTag.java:84)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at
org.kohsuke.stapler.jelly.JellyClassTearOff.invokeScript(JellyClassTearOff.java:65)
at
org.kohsuke.stapler.jelly.JellyClassTearOff.serveIndexJelly(JellyClassTearOff.java:78)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:199)
at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:207)
at
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:216)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:161)
at org.kohsuke.stapler.Stapler.service(Stapler.java:77)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)