Internal Server Error

Argument 1 passed to ls\models\ActiveRecord::deleteDependent() must be an instance of CDbConnection, none given, called in /var/www/ls3/protected/controllers/SurveysController.php on line 313 and defined

An internal error occurred while the Web server was processing your request. Please contact the webmaster to report this problem.

Thank you.

2015-10-20 08:46:01
Application Log
Timestamp Level Category Message
08:46:01.558438 error php 
Argument 1 passed to ls\models\ActiveRecord::deleteDependent() must be an
instance of CDbConnection, none given, called in
/var/www/ls3/protected/controllers/SurveysController.php on line 313 and
defined (/var/www/ls3/protected/traits/DependentRecordTrait.php:18)
Stack trace:
#0
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/actions/CAction.php(109):
ReflectionMethod->invokeArgs()
#1
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/actions/CInlineAction.php(47):
CInlineAction->runWithParamsInternal()
#2
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CController.php(308):
CInlineAction->runWithParams()
#3
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CFilterChain.php(133):
ls\controllers\SurveysController->runAction()
#4
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CFilter.php(40):
CFilterChain->run()
#5
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CController.php(1145):
CAccessControlFilter->filter()
#6
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CInlineFilter.php(58):
ls\controllers\SurveysController->filterAccessControl()
#7
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CFilterChain.php(130):
CInlineFilter->filter()
#8
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CFilter.php(40):
CFilterChain->run()
#9
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CController.php(1145):
CAccessControlFilter->filter()
#10
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CInlineFilter.php(58):
ls\controllers\SurveysController->filterAccessControl()
#11
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/filters/CFilterChain.php(130):
CInlineFilter->filter()
#12
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CController.php(291):
CFilterChain->run()
#13
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CController.php(265):
ls\controllers\SurveysController->runActionWithFilters()
#14
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CWebApplication.php(282):
ls\controllers\SurveysController->run()
#15
/var/www/ls3/protected/vendor/yiisoft/yii/framework/web/CWebApplication.php(141):
WebApplication->runController()
#16 /var/www/ls3/protected/core/WebApplication.php(80):
WebApplication->processRequest()
#17
/var/www/ls3/protected/vendor/yiisoft/yii/framework/base/CApplication.php(184):
WebApplication->processRequest()
#18 /var/www/ls3/protected/entry.php(51): WebApplication->run()
#19 /var/www/ls3/public/index.php(4): include()
REQUEST_URI=/ls3/index.php?r=surveys/deleteMultiple