:ERROR MESSAGE:
org.ofbiz.widget.screen.ScreenRenderException: Error rendering screen [component://ecommerce/widget/CatalogScreens.xml#category]: java.lang.IllegalArgumentException: Error running script at location [component://ecommerce/webapp/ecommerce/WEB-INF/actions/catalog/LayeredNavigation.groovy]: javax.script.ScriptException: java.lang.NullPointerException (Error running script at location [component://ecommerce/webapp/ecommerce/WEB-INF/actions/catalog/LayeredNavigation.groovy]: javax.script.ScriptException: java.lang.NullPointerException)