java.lang.IllegalStateException: getOutputStream() has already been called for this response

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java.lang.IllegalStateException: getOutputStream() has already been called for this response
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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