VelocityViewServlet : Error processing a template for path '/WEB-INF/page/cart/page.vm'

Invocation of method 'getCartPageContent' in class hakodateit.shop.util.tool.VelocityTemplateTool threw exception java.lang.NullPointerException at /WEB-INF/page/cart/page.vm[line 2, column 12]
java.lang.NullPointerException