How do i change a value of a bool value with a bool value?

This line of code is not working for me. And i don't really know why. What i'm trying to do is to change a bool value with another bool value and i'm finding the bool value with a string value. I checked that i have done right and finding the values so i don't think that's an error. However it gives me this error:

"attempt to index a nil value"

game.Workspace.Values.Voting.Result.Survive.Value=game.Lighting:FindFirstChild(game.Workspace.Values.Voting.Result.Value):FindFirstChild("survival").Value

EDIT:

I solved this! In another script i swithced the parent of the model to workspace, to make it work i need to search the model in the workspace and not in the lighting. game.Workspace.Values.Voting.Result.Survive.Value=game.Workspace:FindFirstChild(game.Workspace.Values.Voting.Result.Value):FindFirstChild("survival").Value

I solved this now!

What is the other bool value location? And the name..

local a =game.Lighting:FindFirstChild(game.Workspace.Values.Voting.Result.Value)
local b = a:FindFirstChild("survival").Value

game.Workspace.Values.Voting.Result.Survive.Value = b

Tell me if this gives you the wrong outcome, or errors.