:ERROR MESSAGE:
org.ofbiz.widget.renderer.ScreenRenderException: Error rendering screen [component://envelopes/widget/ProductScreens.xml#shopBySize]: java.lang.IllegalArgumentException: Error running script at location [component://envelopes/webapp/envelopes/WEB-INF/actions/product/sizes.groovy]: java.lang.NullPointerException (Error running script at location [component://envelopes/webapp/envelopes/WEB-INF/actions/product/sizes.groovy]: java.lang.NullPointerException)