Plugin Help LootBox plugin problem

Please Help ! Why the Other MinecraftServer v1.5.2 are allowed to use lootbox. The lootbox plugin have
v2.0b for 1.8.1,
v1.4, 1.3, v1.21, v1.2, v1.1 and this is for 1.7.9
v1.0 for 1.7.2
I try upload all the version one by one in my plugin folder
In v2.0b MCv1.8.1 when I type /lootbox the list of commands doesn't appeared in my screen so I try other again
In all the version of MCv1.7.9 the /lootbox list of commands doesn't appeared too.
In v1.0 MCv1.7.2 /lootbox list of commands appeared but when I add a lootbox named PandoraBox and then when I /lootbox give ArtHD box Pandorabox and open it the items i put inside the PandoraBox doesn't appeared in my inventory but the eco give commands is working please help.

Here is my config.yml for Lootbox ----> http://pastebin.com/D4kJBRWk
Here is my groups.yml for GM ----> http://pastebin.com/uRf5NGJ4
Here is my server.log ----> http://pastebin.com/fQegtyKn

Thank you for your helping !