Can't join my server bug

[REALZulfikar]

When I join It kicks me out and when I check in the app It says this

[18:28:46] [Server thread/INFO]: REALZulfikar[/10.0.0.9:50915] logged in with entity id 12 at (minigames1000, 275, 93, 341)
[18:29:15] [Server thread/INFO]: REALZulfikar joined the game
[18:29:15] [Server thread/CRITICAL]: Error: "Class 'pocketmine\network\mcpe\protocol\SetEntityDataPacket' not found" (EXCEPTION) in "plugins/Slapper_v1.4.2.phar/src/slapper/SlapperTrait" at line 56
[18:29:15] [Server thread/DEBUG]: #0 src/pocketmine/entity/Human(867): slapper\entities\SlapperHuman->sendData(array[1], array[1])
[18:29:15] [Server thread/DEBUG]: #1 plugins/Slapper_v1.4.2.phar/src/slapper/entities/SlapperHuman(35): pocketmine\entity\Human->sendSpawnPacket(object pocketmine\Player)
[18:29:15] [Server thread/DEBUG]: #2 src/pocketmine/entity/Entity(2051): slapper\entities\SlapperHuman->sendSpawnPacket(object pocketmine\Player)
[18:29:15] [Server thread/DEBUG]: #3 src/pocketmine/entity/Human(839): pocketmine\entity\Entity->spawnTo(object pocketmine\Player)
[18:29:15] [Server thread/DEBUG]: #4 src/pocketmine/Player(1096): pocketmine\entity\Human->spawnTo(object pocketmine\Player)
[18:29:15] [Server thread/DEBUG]: #5 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(298): pocketmine\Player->doFirstSpawn()
[18:29:15] [Server thread/DEBUG]: #6 src/pocketmine/network/mcpe/protocol/SetLocalPlayerAsInitializedPacket(45): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleSetLocalPlayerAsInitialized(object pocketmine\network\mcpe\protocol\SetLocalPlayerAsInitializedPacket)
[18:29:15] [Server thread/DEBUG]: #7 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\SetLocalPlayerAsInitializedPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[18:29:15] [Server thread/DEBUG]: #8 src/pocketmine/network/mcpe/protocol/BatchPacket(123): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\SetLocalPlayerAsInitializedPacket)
[18:29:15] [Server thread/DEBUG]: #9 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\BatchPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[18:29:15] [Server thread/DEBUG]: #10 src/pocketmine/Player(3126): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[18:29:15] [Server thread/DEBUG]: #11 src/pocketmine/network/mcpe/RakLibInterface(169): pocketmine\Player->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[18:29:15] [Server thread/DEBUG]: #12 vendor/pocketmine/raklib/src/server/ServerHandler(99): pocketmine\network\mcpe\RakLibInterface->handleEncapsulated(string[14] 10.0.0.9 50915, object raklib\protocol\EncapsulatedPacket, integer 0)
[18:29:15] [Server thread/DEBUG]: #13 src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[18:29:15] [Server thread/DEBUG]: #14 src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[18:29:15] [Server thread/DEBUG]: #15 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe{closure}()
[18:29:15] [Server thread/DEBUG]: #16 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
[18:29:15] [Server thread/DEBUG]: #17 src/pocketmine/Server(2348): pocketmine\snooze\SleeperHandler->sleepUntil(double 1564684155.9873)
[18:29:15] [Server thread/DEBUG]: #18 src/pocketmine/Server(2205): pocketmine\Server->tickProcessor()
[18:29:15] [Server thread/DEBUG]: #19 src/pocketmine/Server(1784): pocketmine\Server->start()
[18:29:15] [Server thread/DEBUG]: #20 src/pocketmine/PocketMine(275): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[34] /storage/emulated/0/PocketMine-MP/, string[42] /storage/emulated/0/PocketMine-MP/plugins/)
[18:29:15] [Server thread/DEBUG]: #21 src/pocketmine/PocketMine(299): pocketmine\server()
[18:29:15] [Server thread/DEBUG]: #22 (1): require(string[89] phar:///storage/emulated/0/PocketMine-MP/PocketMine-MP.phar/src/pocketmine/Pocke)
[18:29:16] [Server thread/INFO]: REALZulfikar left the game
[18:29:16] [Server thread/INFO]: REALZulfikar[/10.0.0.9:50915] logged out due to Internal server error
[18:29:16] [RakLibServer thread/NOTICE]: Blocked 10.0.0.9 for 5 seconds

This keeps happening to me and I hope there's a way to fix it

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[Jason107206]

Try to re-download the pocketmine phar?

[Lentou]

This error is from "Slapper Plugin"

[REALZulfikar]

Then how can I make them all work together?