Fatal error: Uncaught Error: Undefined class constant 'Monolog\Utils::DEFAULT_JSON_FLAGS' in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php:194 Stack trace: #0 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php(113): Monolog\Handler\AbstractHandler->getDefaultFormatter() #1 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(37): Monolog\Handler\AbstractHandler->getFormatter() #2 /var/www/html/vendor/monolog/monolog/src/Monolog/Logger.php(344): Monolog\Handler\AbstractProcessingHandler->handle(Array) #3 /var/www/html/vendor/monolog/monolog/src/Monolog/Logger.php(470): Monolog\Logger->addRecord(500, 'Undefined class...', Array) #4 /var/www/html/system/src/Grav/Common/Errors/Errors.php(73): Monolog\Logger->addCritical('Undefined class...') #5 /var/www/html/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php(50): Grav\Common\Errors\Errors->Grav\Common\Errors\{closure}(Object(Error), Object(Whoops\Exception\Inspector), Object(Whoo in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php on line 194

Fatal error: Uncaught Error: Undefined class constant 'Monolog\Utils::DEFAULT_JSON_FLAGS' in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php:194 Stack trace: #0 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php(113): Monolog\Handler\AbstractHandler->getDefaultFormatter() #1 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(37): Monolog\Handler\AbstractHandler->getFormatter() #2 /var/www/html/vendor/monolog/monolog/src/Monolog/Logger.php(344): Monolog\Handler\AbstractProcessingHandler->handle(Array) #3 /var/www/html/vendor/monolog/monolog/src/Monolog/Logger.php(470): Monolog\Logger->addRecord(500, 'Uncaught Error:...', Array) #4 /var/www/html/system/src/Grav/Common/Errors/Errors.php(73): Monolog\Logger->addCritical('Uncaught Error:...') #5 /var/www/html/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php(50): Grav\Common\Errors\Errors->Grav\Common\Errors\{closure}(Object(Whoops\Exception\ErrorException), Object(Whoops\Excepti in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php on line 194