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ERROR 500: com.instructables.exception.UnknownTypeException: Cannot determine type of Authorable; 'type' is 'null'
Exception
com.instructables.exception.UnknownTypeException: Cannot determine type of Authorable; 'type' is 'null'
at com.instructables.webapp.edit.AuthorableForm.configureStrategy(AuthorableForm.java:351)
at com.instructables.webapp.edit.AuthorableForm.setType(AuthorableForm.java:145)
at com.instructables.webapp.edit.AuthorableForm.load(AuthorableForm.java:165)
at com.instructables.servlet.ActionServlet.fillFormBeanAndValidate(ActionServlet.java:213)
at com.instructables.servlet.ActionServlet.prepare(ActionServlet.java:190)
at com.instructables.servlet.ActionServlet.doGet(ActionServlet.java:279)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)
at com.instructables.servlet.InstructHttpServlet.service(InstructHttpServlet.java:37)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
at com.caucho.filters.GzipFilter.doFilter(GzipFilter.java:218)
at com.instructables.filter.FilterWrapperFilter.doFilter(FilterWrapperFilter.java:54)
at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
at com.instructables.filter.SecurityFilter.doFilter(SecurityFilter.java:164)
at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
at com.instructables.filter.HibernateSessionRequestFilter.doFilter(HibernateSessionRequestFilter.java:71)
at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:520)
at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
at java.lang.Thread.run(Thread.java:595)
Why isn't it working?