array does not work

im trying to make a permissions plugin and i have my config file saved like this with rank player and voyager
Error: Invalid args supplied for foreach()

PHP:

---
player:
- core.testpermission
- core.testpermission
voyager:
- core.testpermission
- core.testpermission
...


why is this not working?

PHP:

         $config = new Config(Core::getInstance()->getDataFolder() . "Permissions.yml", Config::YAML);
         $oldperms = $config->get($this->getRank()); //getRank() returns players rank
         foreach($oldperms as $oldperm){
             $this->addAttachment(Core::getInstance(), $oldperm, false);
         }

 

PHP:

$data = new Config(Core::getInstance()->getDataFolder()."Permissions.yml", Config::YAML, []);
$rank = $this->getRank();
foreach($data->get($rank) as $perm){
///......
}
//Verify If $this->getRank() returns real rank of player ..
I/PHP]

 

there is a couple of things you need to account

the config has not been previously set up and will be emtpy
the path you provided may not be the location of the config
getRank() does not properly return the string you want
your config does not have the rank set up

 

$oldperms does not return an array to be foreached?