Python Script: Selecting Multiple Elements for a Line Based Family

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Hi this line based family script works with one element but it spits out this error message when I select multiple elements.
Does anyone know why? Possibly I need to add a lvlPlane in the script? Please help.

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import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument
curves = UnwrapElement(IN[0])
famtype = UnwrapElement(IN[1])
lvl = UnwrapElement(IN[2])
elementlist = list()
counter = 0

TransactionManager.Instance.EnsureInTransaction(doc)

for curve in curves:
	newobj = doc.Create.NewFamilyInstance(curve.ToRevitType(),famtype,lvl,Structure.StructuralType.NonStructural)
	elementlist.append(newobj.ToDSType(False))

TransactionManager.Instance.TransactionTaskDone()
OUT = elementlist