When I went to find the Core for the Jett 4th Job Advancement in "Steep Hill" in Leafre and I pressed the up key over the sparkling thing and it said "Bla bla here's the core, bla" but then it said I needed space in my equip inventory so I clicked out of it and it advanced me to 4th job and I never got the level 120 Jett Gun. Is there any way to get the gun now?