item.addClaim(claim) perfectly works, but claim.addSource and claim.addQualifier return API error :

File "pwb.py", line 135, in <module>
  run_python_file(fn, argv, argvu)
File "pwb.py", line 67, in run_python_file
  exec(compile(source, filename, "exec"), main_mod.__dict__)
File "cc.py", line 39, in <module>
  claim.addQualifier(date)
File "/home/marin/appliext/kun2/data/pywikibot/page.py", line 3017, in addQualifier
  data = self.repo.editQualifier(self, qualifier, **kwargs)
File "/home/marin/appliext/kun2/data/pywikibot/site.py", line 720, in callee
  return fn(self, *args, **kwargs)
File "/home/marin/appliext/kun2/data/pywikibot/site.py", line 3850, in editQualifier
  data = req.submit()
File "/home/marin/appliext/kun2/data/pywikibot/data/api.py", line 401, in submit
  raise APIError(code, info, **result["error"])

pywikibot.data.api.APIError: invalid-guid: Invalid claim guid

version = '$Id: 2949fa22477edd2b209076d43b2ac1ef9575ff20 $' (downloaded in early january)

code :

-*- coding: utf-8 -*-

import pywikibot
import pickle
import sys
wpcom=unicode(sys.argv[1], 'utf-8')
wpcc=unicode(sys.argv[2], 'utf-8')
site = pywikibot.Site("fr", "wikipedia")
page = pywikibot.Page(site, wpcom)
pagecc = pywikibot.Page(site, wpcc)
item = pywikibot.ItemPage.fromPage(page)
itemcc = pywikibot.ItemPage.fromPage(pagecc)
site = pywikibot.Site("wikidata", "wikidata")
repo = site.data_repository()
dictionary = item.get()
dictionarycc = itemcc.get()
verif=dictionarycc['labels']['fr']
print "La commune est située dans la ", verif
#création de la déclaration principale (claim)
claim = pywikibot.Claim(repo, u'P131')
claim.setTarget(itemcc)
print claim
date = pywikibot.Claim(repo, u'P585')
wikidatevrai = pywikibot.WbTime(year=2013, month=1, day=1)
print "wikidatevrai :", wikidatevrai
date.setTarget(wikidatevrai)
tmp=date.getTarget()
print "tmp", tmp
print "date :", date
claim.addQualifier(date)
print claim
#création de la source
source1 = pywikibot.Claim(repo, u'P854')
source1.setTarget(u'Q2981593')
#qualificateur pour la source (?)
qualif1 = pywikibot.Claim(repo, u'P357')
qualif1.setTarget(u'base des EPCI à fiscalité propre au 1er janvier 2013')
#source1.addQualifier(qualif1)
qualif2 = pywikibot.Claim(repo, u'P577')
wikidatecons=pywikibot.WbTime(year=2013, month=8, day=28)
print wikidatecons
qualif2.setTarget(wikidatecons)
#source1.addQualifier(qualif2)
#claim.addSources(source1)
item.addClaim(claim)

Thank you.

Version: core-(2.0)
Severity: normal
OS: Linux
Platform: PC