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java.lang.NullPointerException: null	at org.springframework.web.method.annotation.ModelFactory.findSessionAttributeArguments(ModelFactory.java:141)	at org.springframework.web.method.annotation.ModelFactory.initModel(ModelFactory.java:99)	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:722)	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:816)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)