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java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at grails.converters.JSON.value(JSON.java:198) at grails.converters.JSON.convertAnother(JSON.java:161) at grails.converters.JSON.value(JSON.java:198) at grails.converters.JSON.convertAnother(JSON.java:161) at grails.converters.JSON.value(JSON.java:198) at grails.converters.JSON.render(JSON.java:133) at grails.converters.JSON.render(JSON.java:149) at translate.AdminController$_closure17.doCall(AdminController.groovy:181) at translate.AdminController$_closure17.doCall(AdminController.groovy) 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)