"Unable to cast value to Objects" in line 5

[LucasGamesz_YT (LucasGamesz)]

This is the script:

	local object = workspace:WaitForChild("PreviewObject")
	
	local raycastParameters = RaycastParams.new()
	raycastParameters.FilterType = Enum.RaycastFilterType.Blacklist
	raycastParameters.FilterDescendantsInstances = (object)
	raycastParameters.IgnoreWater = true

This what is inside PreviewObject:

[OneGameLater]

@LucasGamesz_YT

local object = workspace:WaitForChild("PreviewObject")
	
	local raycastParameters = RaycastParams.new()
	raycastParameters.FilterType = Enum.RaycastFilterType.Blacklist
	raycastParameters.FilterDescendantsInstances = (object)
	raycastParameters.IgnoreWater = true

You have object in parenthesis instead of Curly Brackets

change it to this:
raycastParameters.FilterDescendantsInstances = {object}