Cant reclaim wolf collars from feast quartemaster

Cant reclaim wolf collars from feast quartemaster

Date & Time: 12/11/2018 14:25
Frequency: always
World name: Ragnarok
Character name: Vincent Leonhire
Retainer name: ---
NPC name: Feast Quartemaster
Monster name: ---
Class/Level: ---
Party or solo: solo
In-game time: ---
Area and coordinates: Wolves'Den Pier X:4.9 Y:5.8
Housing: ---
Steps:
1. While im trying to claim my wolf collars from the ncp it says "Inventory is full. Make room in your inventory and speak with the Feast quartermaster once again to claim your reward." but ofc i have free slot in my inventory.
I already lost collars from the previous season but now it happened again.

Connection Specs
- Type of internet connection/provider: Wind Infostrada
- Modem maker/model number: ZYXEL VMG8823