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- grails.web.mapping.exceptions.UrlMappingException: Unable to establish controller name to dispatch for [null]. Dynamic closure invocation returned null. Check your mapping file is correct, when assigning the controller name as a request parameter it cannot be an optional token! at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)