Why is my output saying: 'attempt to index nil with Play'?

The output says: 'attempt to index nil with Play'

My code:

These are just the main parts (no ends because not needed for question)

local fireAnim = Instance.new('Animation')
fireAnim.Parent = framework.viewmodel
fireAnim.Name = 'Fire'
fireAnim.AnimationId = framework.module.fireAnim
fireAnim = framework.viewmodel.AnimationController.Animator:LoadAnimation(fireAnim)

if input.UserInputType == Enum.UserInputType.MouseButton1 then
    fireAnim:Play()
end