When im doing //fix here's the error I'm getting

[10:32:24] [Server thread/CRITICAL]: Error: "Class 'pocketmine\network\mcpe\protocol\FullChunkDataPacket' not found" (EXCEPTION) in "plugins/BuilderTools.phar/src/czechpmdevs/buildertools/editors/Filler" at line 151
[10:32:24] [Server thread/CRITICAL]: #0 plugins/BuilderTools.phar/src/czechpmdevs/buildertools/editors/Filler(177): czechpmdevs\buildertools\editors\Filler->czechpmdevs\buildertools\editors{closure}(object pocketmine\level\Level, integer -75, integer -179, integer -72, integer -177)
[10:32:24] [Server thread/CRITICAL]: #1 plugins/BuilderTools.phar/src/czechpmdevs/buildertools/editors/Fixer(118): czechpmdevs\buildertools\editors\Filler->fill(object pocketmine\Player, object czechpmdevs\buildertools\editors\object\BlockList)
[10:32:25] [Server thread/CRITICAL]: #2 plugins/BuilderTools.phar/src/czechpmdevs/buildertools/commands/FixCommand(83): czechpmdevs\buildertools\editors\Fixer->fix(integer -78, integer 80, integer -194, integer -71, integer 78, integer -164, object pocketmine\level\Level, object pocketmine\Player)
[10:32:25] [Server thread/CRITICAL]: #3 pmsrc/src/pocketmine/command/SimpleCommandMap(248): czechpmdevs\buildertools\commands\FixCommand->execute(object pocketmine\Player, string[4] /fix, array[0])
[10:32:25] [Server thread/CRITICAL]: #4 pmsrc/src/pocketmine/Server(1809): pocketmine\command\SimpleCommandMap->dispatch(object pocketmine\Player, string[4] /fix)
[10:32:25] [Server thread/CRITICAL]: #5 pmsrc/src/pocketmine/Player(2351): pocketmine\Server->dispatchCommand(object pocketmine\Player, string[4] /fix)
[10:32:25] [Server thread/CRITICAL]: #6 pmsrc/src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(239): pocketmine\Player->chat(string[5] //fix)
[10:32:25] [Server thread/CRITICAL]: #7 pmsrc/src/pocketmine/network/mcpe/protocol/CommandRequestPacket(54): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleCommandRequest(object pocketmine\network\mcpe\protocol\CommandRequestPacket)
[10:32:25] [Server thread/CRITICAL]: #8 pmsrc/src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(109): pocketmine\network\mcpe\protocol\CommandRequestPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[10:32:25] [Server thread/CRITICAL]: #9 pmsrc/src/pocketmine/network/mcpe/protocol/BatchPacket(130): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\CommandRequestPacket)
[10:32:25] [Server thread/CRITICAL]: #10 pmsrc/src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(109): pocketmine\network\mcpe\protocol\BatchPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[10:32:25] [Server thread/CRITICAL]: #11 pmsrc/src/pocketmine/Player(3311): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[10:32:25] [Server thread/CRITICAL]: #12 pmsrc/src/pocketmine/network/mcpe/RakLibInterface(169): pocketmine\Player->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[10:32:25] [Server thread/CRITICAL]: #13 pmsrc/vendor/pocketmine/raklib/src/server/ServerHandler(95): pocketmine\network\mcpe\RakLibInterface->handleEncapsulated(string[15] 127.0.0.1 50529, object raklib\protocol\EncapsulatedPacket, integer 0)
[10:32:25] [Server thread/CRITICAL]: #14 pmsrc/src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[10:32:25] [Server thread/CRITICAL]: #15 pmsrc/src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[10:32:25] [Server thread/CRITICAL]: #16 pmsrc/vendor/pocketmine/snooze/src/SleeperHandler(113): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe{closure}()
[10:32:25] [Server thread/CRITICAL]: #17 pmsrc/vendor/pocketmine/snooze/src/SleeperHandler(75): pocketmine\snooze\SleeperHandler->processNotifications()
[10:32:25] [Server thread/CRITICAL]: #18 pmsrc/src/pocketmine/Server(2155): pocketmine\snooze\SleeperHandler->sleepUntil(double 1621755144.8657)
[10:32:25] [Server thread/CRITICAL]: #19 pmsrc/src/pocketmine/Server(1992): pocketmine\Server->tickProcessor()
[10:32:25] [Server thread/CRITICAL]: #20 pmsrc/src/pocketmine/Server(1586): pocketmine\Server->start()
[10:32:25] [Server thread/CRITICAL]: #21 pmsrc/src/pocketmine/PocketMine(291): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[51] C:\Users\X543MA-C14ST\Desktop\PocketMine-MP-3.19.0, string[59] C:\Users\X543MA-C14ST\Desktop\PocketMine-MP-3.19.0\plugins)
[10:32:25] [Server thread/CRITICAL]: #22 pmsrc/src/pocketmine/PocketMine(321): pocketmine\server()
[10:32:25] [Server thread/CRITICAL]: #23 pmsrc(11): require(string[106] phar://C:/Users/X543MA-C14ST/Desktop/PocketMine-MP-3.19.0/PocketMine-MP.phar/src)