Why do I get this error?

this is the codeim using to detect when a block calledblock1 its the otherblock:

function detect(hit) -- Beginning a function
if hit and hit.Name == "Block1" then -- If statement to check for the name and if the object exists.
local assetId = 304840138
game:GetService("InsertService"):LoadAsset(assetId).Parent = game.Workspace
end -- end for if statement
end -- end for function.


script.Parent.Touched:connect(detect)  -- Connects function to event.

But when i run it and the block touches the other blocki get this output:

gah
11:49:43.970 - Plugin_142619509.1.put in worksoace:9: attempt to index local 'sl' (a nil value)
11:49:43.973 - Stack Begin
11:49:43.975 - Script 'Plugin_142619509.1.put in worksoace', Line 9
11:49:43.975 - Stack End
11:49:44.797 - httpGet http://assetgame.roblox.com/Asset/?id=304840138&serverplaceid=0&clientinsert=0 failed. Trying again. Error: HTTP 403 (HTTP/1.1 403 Forbidden).  Elapsed time: 0.869079
11:49:45.624 - Content failed for http://assetgame.roblox.com/Asset/?id=304840138&serverplaceid=0&clientinsert=0 because HTTP 403 (HTTP/1.1 403 Forbidden)
11:49:45.627 - Content failed because HTTP 403 (HTTP/1.1 403 Forbidden)
11:49:45.640 - HTTP 403 (HTTP/1.1 403 Forbidden)
11:49:45.642 - Script 'Workspace.Part.Script', Line 4
11:49:45.644 - Stack End
11:49:45.665 - HTTP 403 (HTTP/1.1 403 Forbidden)
11:49:45.669 - Script 'Workspace.Part.Script', Line 4
11:49:45.673 - Stack End
11:49:45.675 - HTTP 403 (HTTP/1.1 403 Forbidden)
11:49:45.676 - Script 'Workspace.Part.Script', Line 4
11:49:45.678 - Stack End

I havent got any plugins activated and Ihavent got anywhere called worksoace. I have got a block called Block1 in my workspace.

Any helpplease. Thanks