Yup, sorry… You need to make sure you create a reference array to store the references. Here is the full working code…
import clr
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
app = DocumentManager.Instance.CurrentUIApplication.Application
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)
clr.AddReference("RevitAPI")
from Autodesk.Revit.DB import *
def tolist(obj1):
if hasattr(obj1,"__iter__"): return obj1
else: return [obj1]
view = tolist(UnwrapElement(IN[0]))[0]
dimLines = tolist(UnwrapElement(IN[1]))
linesToDim = tolist(UnwrapElement(IN[2]))
refArrays = []
outList = []
for lineList in linesToDim:
rArr = ReferenceArray()
for l in lineList:
rArr.Append(Reference(l))
refArrays.append(rArr)
TransactionManager.Instance.EnsureInTransaction(doc)
for l,r in zip(dimLines,refArrays):
try:
outList.append(doc.Create.NewDimension(view,l.GeometryCurve,r))
except Exception,e:
outList.append(e.message)
TransactionManager.Instance.TransactionTaskDone()
OUT = outList
This should work for you. Easier now I have a pc with a monitor! 
