Fatal error: Uncaught exception 'MongoDB\Driver\Exception\CommandException' with message 'FieldPath cannot be constructed with empty string' in /usr/share/php/vendor/mongodb/mongodb/src/Operation/Aggregate.php:263 Stack trace: #0 /usr/share/php/vendor/mongodb/mongodb/src/Operation/Aggregate.php(263): MongoDB\Driver\Server->executeReadCommand('klub_tora_si', Object(MongoDB\Driver\Command), Array) #1 /usr/share/php/vendor/mongodb/mongodb/src/Collection.php(223): MongoDB\Operation\Aggregate->execute(Object(MongoDB\Driver\Server)) #2 /home/dojo/domains/klub-tora.si/front/classes/engine28.class.php(856): MongoDB\Collection->aggregate(Array, Array) #3 /home/dojo/domains/klub-tora.si/front/classes/posts28.class.php(79): Engine28->getPrevNext(Array, Array) #4 /home/dojo/domains/klub-tora.si/front/classes/posts28.class.php(49): Posts28->singlePost(Array) #5 /home/dojo/domains/klub-tora.si/front/index.php(266): Posts28->execute() #6 /home/dojo/domains/klub-tora.si/public_html/index.php(2): require('/home/dojo/doma...') #7 {main} in /usr/share/php/vendor/mongodb/mongodb/src/Operation/Aggregate.php on line 263