I use the ultra vaults plugin. on alpha 10 works well, in alpha 11 it also works but if opening a certain vault then the server directly closed Code: PocketMine-MP Crash Dump Sun Apr 15 00:29:27 UTC 2018 Error: ultravaults\Core::initVault(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "pocketmine\item\DiamondSword" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide an autoloader to load the class definition File: plugins/UltraVaults/src/ultravaults/Core Line: 124 Type: E_ERROR THIS CRASH WAS CAUSED BY A PLUGIN BAD PLUGIN: UltraVaults v1.1.0 Code: [115] $tile = Tile::createTile("Chest", $pos->level, $nbt); [116] # var_dump($tile->hasName()); // For purposes [117] $block = Block::get(Block::CHEST); [118] $block->position($tile); [119] $block->getLevel()->sendBlocks([$player], [$block]); [120] $tile->spawnTo($player); [121] $inv = new VaultInventory($tile, $vaultId, $owner); [122] $items = self::getVaultContents($vaultId, $owner); [123] foreach($items as $slot => $content){ [124] if($content->getId() !== 0){ [125] $inv->setItem($slot, $content); [126] } [127] } [128] return $inv; [129] } [130] } [131] [132] [133] [134] Backtrace: PocketMine-MP version: 1.7dev #913 [Protocol 223; API 3.0.0-ALPHA11] Git commit: 0000000000000000000000000000000000000000 uname -a: Linux AdreonDev 4.4.0-116-generic #140-Ubuntu SMP Mon Feb 12 21:23:04 UTC 2018 x86_64 PHP Version: 7.2.2 Zend version: 3.2.0 OS : Linux, linux Loaded plugins: DevTools 1.12.9 by PocketMine Team for API(s) 3.0.0-ALPHA7, 3.0.0-ALPHA8, 3.0.0-ALPHA9, 3.0.0-ALPHA10, 3.0.0-ALPHA11 PiggyCustomEnchants 1.1.2 by DaPigGuy for API(s) 3.0.0-ALPHA11 FormAPI 1.1 by jojoe77777 for API(s) 3.0.0-ALPHA7, 3.0.0-ALPHA8, 3.0.0-ALPHA9, 3.0.0-ALPHA10, 3.0.0-ALPHA11 EnchantUI 1.5.0 by XeonWZ for API(s) 3.0.0-ALPHA11 EconomyAPI 5.7.1-5 by onebone for API(s) 3.0.0-ALPHA7, 3.0.0-ALPHA8, 3.0.0-ALPHA9, 3.0.0-ALPHA10, 3.0.0-ALPHA11 VanillaEnchantments 3.0.0-ALPHA11 by TheAz928 for API(s) 3.0.0-ALPHA9, 3.0.0-ALPHA10, 3.0.0-ALPHA11, 3.0.0-ALPHA12 UltraVaults 1.1.0 by TheAz928 for API(s) 3.0.0-ALPHA8, 3.0.0-ALPHA9, 3.0.0-ALPHA10, 3.0.0-ALPHA11 ----------------------REPORT THE DATA BELOW THIS LINE----------------------- ===BEGIN CRASH 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the plugin is broken because it used serialisation on core objects/classes. More can be found here: https://forums.pmmp.io/threads/why-not-to-serialize-objects-for-storage.5614/