When 3.0.0-ALPHA6, my plugin loads well, but in 3.0.0-ALPHA7, I can see crashdump;; CRASHDUMP: PocketMine-MP Crash Dump Thu Jul 27 08:12:12 AWST 2017 Error: Declaration of nlog\NLOGParticleSponsor\Main:nCommand(pocketmine\command\CommandSender $sender, pocketmine\command\Command $cmd, $label, array $args) must be compatible with pocketmine\command\CommandExecutor:nCommand(pocketmine\command\CommandSender $sender, pocketmine\command\Command $command, string $label, array $args): bool File: NLOGParticleSponsor_v1.phar/src/nlog/NLOGParticleSponsor/Main Line: 16 Type: E_COMPILE_ERROR THIS CRASH WAS CAUSED BY A PLUGIN Code: [7] use pocketmine\utils\Utils; [8] use pocketmine\utils\Config; [9] use pocketmine\command\CommandSender; [10] use pocketmine\command\Command; [11] use pocketmine\Player; [12] use pocketmine\event\player\PlayerMoveEvent; [13] use pocketmine\level\particle\DustParticle; [14] use pocketmine\level\particle\PortalParticle; [15] [16] class Main extends PluginBase implements Listener { [17] [18] const TAG = "§b§o[ Info ] §7"; [19] [20] public $cash, $pardb; [21] [22] public function onEnable() { [23] [24] $this->getServer()->getPluginManager()->registerEvents($this, $this); [25] [26] Backtrace: PocketMine-MP version: 1.6.2dev #313 [Protocol 113; API 3.0.0-ALPHA7] Git commit: b3dada4cb91380fea6f545696fb672dabf5d90fc uname -a: Windows NT DESKTOP-323L1FB 10.0 build 15063 (Windows 10) AMD64 PHP Version: 7.0.3 Zend version: 3.0.0 OS : WINNT, win Loaded plugins: DevTools 1.12.1 by PocketMine Team for API(s) 3.0.0-ALPHA7 ----------------------REPORT THE DATA BELOW THIS LINE----------------------- ===BEGIN CRASH DUMP=== eNrNWn9v20iS/SoNOcDaB1EmJVuyFXgBT+zM5jaOtbGDHC4aGE2yKXFNsjls0rJmMN99X1U3Kcrx Bou7PeCSP0z2j+rq6qpXr5r6fVCnuRrMg1M/CIKTyWQ8HKiq0tVg/vug3pboGlw/vLu9WXz4eP1w /fnz7efBcJArY+SK+q5UlMlK1qkuhE5EkenVcvnp4+3PC1nVaZSpu1IXRlfL5Y1Mi/lcF+90nssi Pix19KjqPC3UchnZtuXSdd6pIlaVeGP471D8aKx4E+XxULzJZKiyoZBVJbfijaxW5kjkjalFqATm 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You have to edit your plugins to the new API. Just editing the specified api version inside the plugin.yml will not work for most plugins. These are probably the most widely affecting changes for plugins: https://github.com/pmmp/PocketMine-MP/commit/46a2e6cbf8f1fd71e632b1d3b4ccc34492683721 (This whole situation should explain itself anyway. An API version change indicates something like this. If the plugin wasn't written for the new version, you should expect failure and not a perfect working plugin.)