Sonic Styled Jump not working? No output or error..

###It is not working because of line 6. You're checking if an event equals true, which will not run because events don't equal true. You'll instead want to use the Jumping event over a loop.

local jumpin = script.Parent
local human = script.Parent.Parent.Humanoid

human.Jumping:Connect(function(active)
    wait()
    if active then -- if still active jumping 
            print("Jump")
            local transparencia = 1

            for k,v in pairs(jumpin:GetChildren())do
                if v:IsA("BasePart") then
                    v.Transparency = transparencia
                    script.Parent.Transparency = 0
                    human.Parent.HumanoidRootPart.Transparency = 1
                end
            end
        end

        if not active then
            print("Floor")
            local transparencia = 0

            for k,v in pairs(jumpin:GetChildren())do
                if v:IsA("BasePart") then
                    v.Transparency = transparencia
                    script.Parent.Transparency = 1
                    human.Parent.HumanoidRootPart.Transparency = 1      
            end
        end
    end
end)