java.lang.NullPointerException

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  • java.lang.NullPointerException: Cannot invoke method toLowerCase() on null object at grails.plugin.inviter.module.YahooInviterService$_getContacts_closure2.doCall(YahooInviterService.groovy:70) at java.util.Arrays.mergeSort(Arrays.java:1270) at java.util.Arrays.sort(Arrays.java:1210) at java.util.Collections.sort(Collections.java:159) at grails.plugin.inviter.module.YahooInviterService.getContacts(YahooInviterService.groovy:70) at grails.plugin.inviter.module.YahooInviterService$$FastClassByCGLIB$$5b6d56f6.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at grails.plugin.inviter.module.YahooInviterService$$EnhancerByCGLIB$$e4b61be8.getContacts(<generated>) at grails.plugin.inviter.module.YahooInviterService$getContacts.call(Unknown Source) at grails.plugin.inviter.InviterController$_closure4.doCall(InviterController.groovy:77) at grails.plugin.inviter.InviterController$_closure4.doCall(InviterController.groovy) at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:376) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.apache.shiro.grails.SavedRequestFilter.doFilter(SavedRequestFilter.java:55) at com.studentsonly.grails.plugins.uiperformance.CacheFilter.doFilter(CacheFilter.java:67) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662)
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