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Soft errors vs Regular errors

Soft errors are errors which would occur however the script would still continue its execution. Regular errors will stop the script from proceeding.

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With Connect

We are actively working to make error handling very easy. In functions like Connect or ConnectEvent clua will return nil or a string. If a error occurs: then it will return a string which will be the error message. Let us see an example: 
local Cube = Map.Cube
local error = Cube:Connect("OnBodyEntered", __SCRIPT__, "ToCallFunc") -- the value of error will be nil however if we try to conenct again:
error = Cube:Connect("OnBodyEntered", __SCRIPT__, "ToCallFunc") -- the value of error will be a string of: 'OnBodyEntered(Signal) is already connected to a function!'
error = Cube:Connect("OnBodyEntered", __SCRIPT__, "AnotherFunction") -- the value of error will be a string as well. Clua does not support binding a single signal to multiple functions. However this is going to be allowed in near-future. It will return the same error: : 'OnBodyEntered(Signal) is already connected to a function!'
-- Keep in mind that it will only give a error and will not distrupt already-connected connection!
function ToCallFunc(body) 
    printl(body.IsA())
end

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Now lets see it step by step

local Cube = Map.Cube
local error = Cube:Connect("OnBodyEntered", __SCRIPT__, "ToCallFunc")
if error == nil then
    printl("We had NO errors!")
else 
    printl("We have a error! " .. error)
    -- lets carry a fix
    Cube:BreakConnection("OnBodyEntered") -- if a signal doesnt exist then it will return a string of: 'No signal found.'
    error = Cube:Connect("OnBodyEntered", __SCRIPT__, "ToCallFunc")
    if error == nil then
        printl("Successfully established!")
    else
        printl("Core engine error") -- report to developers immediately!
    end
end

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Why not use pcall?

Unfortunately as of now the engine related functions do not support pcall. In future engine-related functions will slowly get support to work with pcalls.

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Errors with other methods