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Grails Runtime Exception

Error Details

Error 500: Executing action [otherRaw] of controller [art.DirectoryController] caused exception: Cannot invoke method getSubCategories() on null object
Servlet: grails
URI: /art/grails/directory.dispatch
Exception Message: Cannot invoke method getSubCategories() on null object
Caused by: Cannot invoke method getSubCategories() on null object
Class: gsp_art_directoryindex_gsp
At Line: [39]
Code Snippet:

Stack Trace

java.lang.NullPointerException: Cannot invoke method getSubCategories() on null object

	at art.DirectoryController$_closure7.doCall(DirectoryController.groovy:65)

	at art.DirectoryController$_closure7.doCall(DirectoryController.groovy)

	at gsp_art_directoryindex_gsp$_run_closure2.doCall(gsp_art_directoryindex_gsp.groovy:34)

	at gsp_art_directoryindex_gsp$_run_closure2.doCall(gsp_art_directoryindex_gsp.groovy)

	at gsp_art_directoryindex_gsp.run(gsp_art_directoryindex_gsp.groovy:39)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

	at java.lang.Thread.run(Thread.java:701)

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