Error: "attempt to call a nil value" when plugging instance into function

[Modlons (Modded)]

I’m working on a script that generates a tree similar to lumber tycoon 2. The issue I am running into is when I attempt to call the function to create a new branch after passing the parent branch, I get the error: “attempt to call a nil value”

Snippet:

while(wait(growthRate))do
	
	for i, branch in pairs(branchGrowthXZ) do
		
		if table.find(branchGrowthY, branch) then
			
			if branch.Size.Y >= templateTreeData.maxLength then
				

                --function that outputs the error:
				newBranch(branch)
				
				local branchIndex = table.find(branchGrowthY, branch)
				print(branch)
				table.remove(branchGrowthY, branchIndex)

			else

				branch.Size = branch.Size + Vector3.new(0, 0.1, 0)
				branch.CFrame = branch.CFrame:ToWorldSpace(CFrame.new(0, 0.05, 0))

			end
			
		end
		
		branch.Size = branch.Size + Vector3.new(0.01, 0, 0.01)
		
	end
	
end

I’ve tried moving around the table.remove function, and when priting the value everything is outputed just fine:

[Bikereh (green_lady)]

it means the the newBranch function doesnt exist. check the name, and check if the function comes after the loop in the script. if it comes after, put it before