✓ Accepted answer
There are two method you could do what you're trying to do:
The first would be to use FindFirstChildOfClass("Frame"), like so
local frame = script.parent.parent.ordertools:FindFirstChildOfClass("Frame")
if frame then
print("Frame destroyed")
frame:Destroy()
else
print("Frame does not exist")
end
Otherwise you could use a loop, like so
local fold = script.parent.parent.ordertools:GetChildren()
for _,v in pairs(fold) do
if v:IsA("Frame") then
v:Destroy()
end
end
The first option would be if there's only one frame, the second is if there are multiple frames.
The reason your code did not work is because it was trying to see if an array was a frame. When you use GetChildren() it returns an array. If you want to index it you use a loop or you can index it directly.
Your code essentially was doing this:
if {Frame, Frame}:IsA("Frame") then
So since you're trying to use IsA() on something that is not an instance it error-ed.