Fatal error: Uncaught Error: Call to a member function encode() on null in F:\duqu8.com\SaxueFrame\model\module_question.php:236 Stack trace: #0 F:\duqu8.com\SaxueWap\detail.php(52): saxuemodulequestionhandler->detail(Array) #1 {main} thrown in F:\duqu8.com\SaxueFrame\model\module_question.php on line 236