An Error occurred while handling another error:
yii\base\InvalidArgumentException: Response content must not be an array. in /home/www/qianfan8/sapi/vendor/yiisoft/yii2/web/Response.php:1111
Stack trace:
#0 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->prepare()
#1 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send()
#2 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/base/ErrorHandler.php(152): yii\web\ErrorHandler->renderException()
#3 [internal function]: yii\base\ErrorHandler->handleException()
#4 {main}
Previous exception:
yii\base\ErrorException: Trying to access array offset on value of type null in /home/www/qianfan8/sapi/frontend/modules/fenleiPc/actions/index/ListAction.php:70
Stack trace:
#0 /home/www/qianfan8/sapi/frontend/modules/fenleiPc/actions/index/ListAction.php(70): yii\base\ErrorHandler->handleError()
#1 [internal function]: frontend\modules\fenleiPc\actions\index\ListAction->run()
#2 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/base/Action.php(93): call_user_func_array()
#3 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/base/Controller.php(178): yii\base\Action->runWithParams()
#4 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/base/Module.php(552): yii\base\Controller->runAction()
#5 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction()
#6 /home/www/qianfan8/sapi/vendor/yiisoft/yii2/base/Application.php(409): yii\web\Application->handleRequest()
#7 /home/www/qianfan8/sapi/frontend/web/index.php(135): yii\base\Application->run()
#8 {main}