一访问就报错:com.ibm.ws.webcontainer.webapp.WebApp logServletError SRVE0293E: [Servlet Error]-[/.../main.jsp]: com.ibm.ws.jsp.JspCoreException: JSPG0049E: /.../main.jsp failed to compile 。 com.ibm.ws.jsp.tagfile.webinf._layout cannot be resolved to a type请问这个问题要怎么处理的?