An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /home/qso/yii/frontend/modules/statistics/controllers/RussiaController.php on line 78. in /home/qso/yii/vendor/yiisoft/yii2/web/Response.php:369
Stack trace:
#0 /home/qso/yii/vendor/yiisoft/yii2/web/Response.php(342): yii\web\Response->sendHeaders()
#1 /home/qso/yii/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send()
#2 /home/qso/yii/vendor/yiisoft/yii2/base/ErrorHandler.php(152): yii\web\ErrorHandler->renderException(Object(yii\base\UnknownMethodException))
#3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\base\UnknownMethodException))
#4 {main}
Previous exception:
yii\base\UnknownMethodException: Calling unknown method: common\models\RussiaStatisticViewQuery::f() in /home/qso/yii/vendor/yiisoft/yii2/base/Component.php:308
Stack trace:
#0 /home/qso/yii/frontend/modules/statistics/controllers/RussiaController.php(81): yii\base\Component->__call('f', Array)
#1 [internal function]: frontend\modules\statistics\controllers\RussiaController->actionView(1122)
#2 /home/qso/yii/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)
#3 /home/qso/yii/vendor/yiisoft/yii2/base/Controller.php(178): yii\base\InlineAction->runWithParams(Array)
#4 /home/qso/yii/vendor/yiisoft/yii2/base/Module.php(552): yii\base\Controller->runAction('view', Array)
#5 /home/qso/yii/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction('statistics/russ...', Array)
#6 /home/qso/yii/vendor/yiisoft/yii2/base/Application.php(384): yii\web\Application->handleRequest(Object(yii\web\Request))
#7 /home/qso/yii/frontend/web/index.php(18): yii\base\Application->run()
#8 {main}