Build hung notification throws exceptions

BAMPLUGINSCORE-JBAM-JIRA44-1426 may have hung.
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This build has been running for
No signature of method getPrettyPrint matches the arguments
The problematic instruction:
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==> ${durationUtils.getPrettyPrint(buildTime)} [on line 411, column 33 in freemarker-lib/ui.ftl]
in user-directive ui.displayBuildHungDurationInfoText [on line 4, column 1 in notification-templates/BuildHungIm.ftl]
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Java backtrace for programmers:
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freemarker.template.TemplateModelException: No signature of method getPrettyPrint matches the arguments
at freemarker.ext.beans.MethodMap.getMemberAndArguments(MethodMap.java:94)
at freemarker.ext.beans.OverloadedMethodModel.exec(OverloadedMethodModel.java:101)
at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:93)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Macro$Context.runMacro(Macro.java:172)
at freemarker.core.Environment.visit(Environment.java:603)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:289)
at freemarker.template.Template.process(Template.java:243)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPageWithNoContext(BambooFreemarkerManager.java:492)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPage(BambooFreemarkerManager.java:426)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPage(BambooFreemarkerManager.java:374)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderTemplateToString(BambooFreemarkerManager.java:586)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPage(BambooFreemarkerManager.java:340)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.render(BambooFreemarkerManager.java:327)
at com.atlassian.bamboo.notification.buildhung.BuildHungNotification.getIMContent(BuildHungNotification.java:215)
at com.atlassian.bamboo.notification.transports.ImTransport.sendNotification(ImTransport.java:74)
at com.atlassian.bamboo.notification.NotificationDispatcherImpl.dispatchNotifications(NotificationDispatcherImpl.java:59)
at com.atlassian.bamboo.notification.buildhung.BuildHungNotificationListener.handleEvent(BuildHungNotificationListener.java:59)
at com.atlassian.bamboo.notification.buildhung.BuildHungNotificationListener.handleEvent(BuildHungNotificationListener.java:16)
at com.atlassian.bamboo.notification.AbstractNotificationEventListener.handleEvent(AbstractNotificationEventListener.java:140)
at sun.reflect.GeneratedMethodAccessor727.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.orm.hibernate.HibernateInterceptor.invoke(HibernateInterceptor.java:117)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy195.handleEvent(Unknown Source)
at com.atlassian.event.legacy.LegacyListenerHandler$LegacyListenerInvoker.invoke(LegacyListenerHandler.java:55)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$2.run(NamedThreadFactory.java:50)
at java.lang.Thread.run(Thread.java:680)

The only legal comparisons are between two numbers, two strings, or two dates.
Left hand operand is a freemarker.template.SimpleScalar
Right hand operand is a freemarker.ext.beans.NumberModel

The problematic instruction:
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==> if buildTime > averageTime && averageTime > 0 [on line 412, column 1 in freemarker-lib/ui.ftl]
in user-directive ui.displayBuildHungDurationInfoText [on line 4, column 1 in notification-templates/BuildHungIm.ftl]
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Java backtrace for programmers:
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freemarker.template.TemplateException: The only legal comparisons are between two numbers, two strings, or two dates.
Left hand operand is a freemarker.template.SimpleScalar
Right hand operand is a freemarker.ext.beans.NumberModel

at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:182)
at freemarker.core.AndExpression.isTrue(AndExpression.java:68)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Macro$Context.runMacro(Macro.java:172)
at freemarker.core.Environment.visit(Environment.java:603)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:289)
at freemarker.template.Template.process(Template.java:243)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPageWithNoContext(BambooFreemarkerManager.java:492)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPage(BambooFreemarkerManager.java:426)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPage(BambooFreemarkerManager.java:374)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderTemplateToString(BambooFreemarkerManager.java:586)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.renderPage(BambooFreemarkerManager.java:340)
at com.atlassian.bamboo.ww2.BambooFreemarkerManager.render(BambooFreemarkerManager.java:327)
at com.atlassian.bamboo.notification.buildhung.BuildHungNotification.getIMContent(BuildHungNotification.java:215)
at com.atlassian.bamboo.notification.transports.ImTransport.sendNotification(ImTransport.java:74)
at com.atlassian.bamboo.notification.NotificationDispatcherImpl.dispatchNotifications(NotificationDispatcherImpl.java:59)
at com.atlassian.bamboo.notification.buildhung.BuildHungNotificationListener.handleEvent(BuildHungNotificationListener.java:59)
at com.atlassian.bamboo.notification.buildhung.BuildHungNotificationListener.handleEvent(BuildHungNotificationListener.java:16)
at com.atlassian.bamboo.notification.AbstractNotificationEventListener.handleEvent(AbstractNotificationEventListener.java:140)
at sun.reflect.GeneratedMethodAccessor727.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.orm.hibernate.HibernateInterceptor.invoke(HibernateInterceptor.java:117)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy195.handleEvent(Unknown Source)
at com.atlassian.event.legacy.LegacyListenerHandler$LegacyListenerInvoker.invoke(LegacyListenerHandler.java:55)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$2.run(NamedThreadFactory.java:50)
at java.lang.Thread.run(Thread.java:680)
.
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