Attempt to concatenate nil with string

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#1

I am debugging my code, since it doesnt work properly. This line is my debugger and it prints attempt to concatenate nil with string. This is the line of code I have problem with:

warn(BallName.." does not equal "..script.Parent.Parent.Parent.ViewportFrame.WorldModel:FindFirstChildWhichIsA("Part").Name)
#2

Either one of these things concatenated could be nil, and roblox doesn’t support concatenating nil with string, or use string interpolation which works with anything

warn(`{BallName} does not equal {script.Parent.Parent.Parent.ViewportFrame.WorldModel:FindFirstChildWhichIsA("Part").Name}`)
#3

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