My Chocobo whistle disappear for the first time i try to use it.

[Phetza]

i try to use it for the first time then after using it my chocobo doesn't come out not only that my chocobo whistle also disappear from my inventory.

[Blackheart]

it's suppost to, go to your skills and you should see "Mounts" you should be able to call your chocobo via commands