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org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error processing GroovyPageView: Error executing tag <twbs:row>: Error executing tag <twbs:column>: Cannot get property 'user' on null object at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:198) at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63) at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53) at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.java:62) at grails.plugin.springsecurity.web.SecurityRequestHolderFilter.doFilter(SecurityRequestHolderFilter.java:59) at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)Caused by: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <twbs:row>: Error executing tag <twbs:column>: Cannot get property 'user' on null object at gsp_tekvideo_coursesignup_gsp$_run_closure2.doCall(gsp_tekvideo_coursesignup_gsp.groovy:104) at gsp_tekvideo_coursesignup_gsp.run(gsp_tekvideo_coursesignup_gsp.groovy:160) ... 9 moreCaused by: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <twbs:column>: Cannot get property 'user' on null object at gsp_tekvideo_coursesignup_gsp$_run_closure2$_closure6.doCall(gsp_tekvideo_coursesignup_gsp.groovy:67) at dk.danthrane.twbs.GridTagLib$_closure2.doCall(GridTagLib.groovy:20) ... 11 moreCaused by: java.lang.NullPointerException: Cannot get property 'user' on null object at gsp_tekvideo_coursesignup_gsp$_run_closure2$_closure6$_closure10.doCall(gsp_tekvideo_coursesignup_gsp.groovy:60) at dk.danthrane.twbs.GridTagLib$_closure3.doCall(GridTagLib.groovy:68) ... 13 more