Model Frame does not show again after hiding

[selfaddicted]

As the title says, I could make a playermodel frame which shows a spell animation like Weakauras does when logged in. But after I hide it, I can't show it again until reloadui

local function CreateAniFrame(parent, path, size, pos, zxy)

  local model = CreateFrame("Playermodel", nil, parent)
  model:SetSize(unpack(size))
  model:SetPoint("CENTER", parent, "CENTER", pos[1], pos[2])
  model:SetModel(path)
  model:SetPosition(unpack(zxy))

end

FYI, it's not a unit portrait or something, it's about spell effect animation. Could anyone give me some clues or some references to fix the issue?