Fatal error: Uncaught Error: Call to undefined method SubmissionFile::getFileSize() in /var/www/html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php:186 Stack trace: #0 /var/www/html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php(110): PKPUsageEventPlugin->buildUsageEvent('ArticleHandler:...', Array) #1 /var/www/html/jurnal/lib/pkp/classes/plugins/HookRegistry.inc.php(107): PKPUsageEventPlugin->getUsageEvent('ArticleHandler:...', Array) #2 /var/www/html/jurnal/pages/article/ArticleHandler.inc.php(426): HookRegistry::call('ArticleHandler:...', Array) #3 /var/www/html/jurnal/lib/pkp/classes/core/PKPRouter.inc.php(397): ArticleHandler->download(Array, Object(Request)) #4 /var/www/html/jurnal/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false) #5 /var/www/html/jurnal/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route(Object(Request)) #6 /var/www/html/jurnal/lib/pkp/classes/core/PKPAppli in /var/www/html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 186