Animation not playing? Animation failed to load

Animation is playing in studio but not in online. Online the character just stands there with the sword out. Here is the portion of the script that plays the animation:

    local anim = hum:LoadAnimation(script.Parent.Slash) 
    local sp = rng:NextNumber(0.8, 1.2)
    if (hum == nil) then return end
    SlashSound.PlaybackSpeed = sp
    SlashSound:Play() 
    anim:Play()

Here is the error:

17:42:16.370 - Animation "https://www.roblox.com//asset/?id=1852409956&serverplaceid=0" failed to load in "Workspace.PlayerHolder.ninjayoshi800.Bronze Sword.Slash.AnimationId": Animation failed to load

I'm new to animations so I have no idea what the problem is, I made the animation like 5 minutes ago should I just wait a bit more and see later? Any help is appreciated