Program Search without Compare

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:///efs/stage-samplesite.terminalfour.net/htdocs/media/sample-site---modules/php-search/search-source.phar/src/T4/PHPSearchLibrary/DocumentCollectionFactory/DocumentCollection.php:163 Stack trace: #0 [internal function]: array_multisort() #1 phar:///efs/stage-samplesite.terminalfour.net/htdocs/media/sample-site---modules/php-search/search-source.phar/src/T4/PHPSearchLibrary/DocumentCollectionFactory/DocumentCollection.php(163): call_user_func_array() #2 /efs/stage-samplesite.terminalfour.net/htdocs/program-hub/program-search/program-compare/config.php(86): T4\PHPSearchLibrary\DocumentCollectionFactory\DocumentCollection->sort() #3 /efs/stage-samplesite.terminalfour.net/htdocs/program-hub/program-search/config.php(26): include_once('...') #4 /efs/stage-samplesite.terminalfour.net/htdocs/program-hub/program-search/program-search-without-compare/index.php(521): include_once('...') #5 {main} thrown in phar:///efs/stage-samplesite.terminalfour.net/htdocs/media/sample-site---modules/php-search/search-source.phar/src/T4/PHPSearchLibrary/DocumentCollectionFactory/DocumentCollection.php on line 163