Exception: Deprecated Functionality: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /var/www/demo3/vendor/magento/framework/Filesystem/Driver/File.php on line 883 in /var/www/demo3/vendor/magento/framework/App/ErrorHandler.php:61
Stack trace:
#0 [internal function]: Magento\Framework\App\ErrorHandler->handler()
#1 /var/www/demo3/vendor/magento/framework/Filesystem/Driver/File.php(883): strpos()
#2 /var/www/demo3/vendor/magento/framework/Filesystem/Directory/Read.php(122): Magento\Framework\Filesystem\Driver\File->getAbsolutePath()
#3 /var/www/demo3/vendor/magento/framework/App/Cache/Frontend/Factory.php(126): Magento\Framework\Filesystem\Directory\Read->getAbsolutePath()
#4 /var/www/demo3/vendor/magento/framework/App/Cache/Frontend/Pool.php(69): Magento\Framework\App\Cache\Frontend\Factory->create()
#5 /var/www/demo3/vendor/magento/framework/App/Cache/Frontend/Pool.php(151): Magento\Framework\App\Cache\Frontend\Pool->_initialize()
#6 /var/www/demo3/vendor/magento/framework/App/Cache/Type/FrontendPool.php(87): Magento\Framework\App\Cache\Frontend\Pool->get()
#7 /var/www/demo3/vendor/magento/framework/App/Cache/Type/Config.php(49): Magento\Framework\App\Cache\Type\FrontendPool->get()
#8 /var/www/demo3/vendor/magento/framework/Cache/Frontend/Decorator/Bare.php(65): Magento\Framework\App\Cache\Type\Config->_getFrontend()
#9 /var/www/demo3/vendor/magento/framework/Interception/PluginList/PluginList.php(297): Magento\Framework\Cache\Frontend\Decorator\Bare->load()
#10 /var/www/demo3/vendor/magento/framework/Interception/PluginList/PluginList.php(266): Magento\Framework\Interception\PluginList\PluginList->_loadScopedData()
#11 /var/www/demo3/generated/code/Magento/Framework/App/State/Interceptor.php(22): Magento\Framework\Interception\PluginList\PluginList->getNext()
#12 /var/www/demo3/vendor/magento/module-developer/Model/Logger/Handler/Debug.php(79): Magento\Framework\App\State\Interceptor->getMode()
#13 /var/www/demo3/vendor/magento/module-developer/Model/Logger/Handler/Debug.php(64): Magento\Developer\Model\Logger\Handler\Debug->isLoggingEnabled()
#14 /var/www/demo3/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(31): Magento\Developer\Model\Logger\Handler\Debug->isHandling()
#15 /var/www/demo3/vendor/monolog/monolog/src/Monolog/Logger.php(344): Monolog\Handler\AbstractProcessingHandler->handle()
#16 /var/www/demo3/vendor/magento/framework/Logger/Monolog.php(48): Monolog\Logger->addRecord()
#17 /var/www/demo3/vendor/monolog/monolog/src/Monolog/Logger.php(712): Magento\Framework\Logger\Monolog->addRecord()
#18 /var/www/demo3/vendor/magento/framework/App/Bootstrap.php(266): Monolog\Logger->error()
#19 /var/www/demo3/pub/index.php(40): Magento\Framework\App\Bootstrap->run()
#20 {main}