PocketMineIDE extension: Nothing happens

Code:

{
   "files.autoSave": "afterDelay",
   "files.associations": {
       "\"*.extension\"": "\"php\""
   },
   "php.pocketMinePath": "C\\Users\\hp\\Documents\\PMMP\\src",
   "php.validate.executablePath": "C:\\Users\\hp\\Documents\\PMMP\\bin\\php\\php.exe"
}

^ settings.json
Nothing is happening. I installed the extension. No autocomplete, nothing.