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This exception has no message.
java.lang.NullPointerException at org.codehaus.groovy.grails.web.pages.GroovyPageOutputStack.lookupStack(GroovyPageOutputStack.java:102) at org.codehaus.groovy.grails.web.pages.GroovyPageOutputStack.currentStack(GroovyPageOutputStack.java:76) at org.codehaus.groovy.grails.web.pages.GroovyPage.initRun(GroovyPage.java:213) at org.codehaus.groovy.grails.web.pages.GroovyPageWritable.doWriteTo(GroovyPageWritable.java:199) at org.codehaus.groovy.grails.web.pages.GroovyPageWritable.writeTo(GroovyPageWritable.java:128) at groovy.lang.Writable$writeTo.call(Unknown Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116) at com.verecloud.nimbus4.mail.TemplateParserService$$EPpsYO6i.renderGSPTemplate(TemplateParserService.groovy:37)