I am trying to create views from levels and put them on a sheet from Excel, but I have a Pyhton node, that dose’nt work properbly.
the script is sometimes working, and it looks like, that the information from excel i correct.
Can anyone help me?
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Can you show the Python code and your inputs? It looks like you have a null or empty list somewhere.
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If you could, please copy and paste your Python code as preformatted text so others can try it without having to retype it all 
This post here is a gif showing how you can post it as preformatted text
It seems that your error is with the Titleblock input. Can you show what you are inputting into the IN[2] port on your Python code?
Sorry, new users can only put 2 links in a post.
Is there another way, so I can Show you the Python Code?
You don’t need to provide a link to share a Python code, just copy it from the Python node, paste it here, select the code text and hit the </> symbol. I typed it up from the Python code from the screenshot you posted above:
import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.Elements)
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
sheetnames = IN[0]
sheetnumbers = IN[1]
titleblock = UnwrapElement(IN[2]) #unwrapped titleblock
sheetlist = list()
TransactionManager.Instance.EnsureInTransaction(doc) # you need an active transaction as you will create elements
for number in range(len(sheetnumbers)):
newsheet = ViewSheet.Create(doc, titleblock.Id) # create a new sheet where titleblock.Id is the id of the tileblock
newsheet.Name = sheetnames[number]
newsheet.SheetNumber = sheetnumbers[number]
sheetlist.append(newsheet.ToDSType(False))
TransactionManager.Instance.TransactionTaskDone()
OUT = sheetlist
It works properly on my end; based on the error you showed in your post, I believe you are giving the node an incorrect input on IN[2]; This is what your inputs should be (IN[0] = list of sheet names, IN[1] = list of sheet numbers, IN[2] = titleblock family type)
Double check that your inputs are correct and try running it again; if it is still giving you an error, post a screen capture of your graph with your inputs showing 
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