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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)