Fatal error: Uncaught TypeError: array_multisort(): Argument #1 ($array) must be an array or a sort flag that has not already been specified in phar:///web/terminalfour/htdocs/media/sample-site/site-assets/php-search/search-source.phar/src/T4/PHPSearchLibrary/DocumentCollectionFactory/DocumentCollection.php:163 Stack trace: #0 [internal function]: array_multisort(4, Array) #1 phar:///web/terminalfour/htdocs/media/sample-site/site-assets/php-search/search-source.phar/src/T4/PHPSearchLibrary/DocumentCollectionFactory/DocumentCollection.php(163): call_user_func_array('array_multisort', Array) #2 /web/terminalfour/htdocs/study/program-compare/config.php(85): T4\PHPSearchLibrary\DocumentCollectionFactory\DocumentCollection->sort('courseTitle', 4) #3 /web/terminalfour/htdocs/study/program-search/config.php(18): include_once('/web/terminalfo...') #4 /web/terminalfour/htdocs/study/program-search/visual-communication/index.php(9): include_once('/web/terminalfo...') #5 {main} thrown in phar:///web/terminalfour/htdocs/media/sample-site/site-assets/php-search/search-source.phar/src/T4/PHPSearchLibrary/DocumentCollectionFactory/DocumentCollection.php on line 163