Dominicbm created this task.
Dominicbm added a project: Pywikibot.
Restricted Application added subscribers: pywikibot-bugs-list, Aklapper.

TASK DESCRIPTION
  Pywikibot does not yet handle the `wikibase-validator-sitelink-conflict` 
error, which occurs when a user attempts to adds a sitelink that is already in 
use. Here is sample traceback:
  
    WARNING: API error failed-save: The save has failed.
    Traceback (most recent call last):
      File "/srv/paws/pwb/pywikibot/page/__init__.py", line 117, in handle
        func(self, *args, **kwargs)
      File "/srv/paws/pwb/pywikibot/page/__init__.py", line 4203, in editEntity
        super().editEntity(data, **kwargs)
      File "/srv/paws/pwb/pywikibot/page/__init__.py", line 3931, in editEntity
        self, data, baserevid=baserevid, **kwargs)
      File "/srv/paws/pwb/pywikibot/tools/__init__.py", line 1481, in wrapper
        return obj(*__args, **__kw)
      File "/srv/paws/pwb/pywikibot/site/_decorators.py", line 94, in callee
        return fn(self, *args, **kwargs)
      File "/srv/paws/pwb/pywikibot/site/__init__.py", line 6034, in editEntity
        return req.submit()
      File "/srv/paws/pwb/pywikibot/data/api.py", line 1982, in submit
        raise APIError(**result['error'])
    pywikibot.data.api.APIError: failed-save: The save has failed.
    [messages: [{'name': 'wikibase-api-failed-save', 'parameters': [], 'html': 
{'*': 'The save has failed.'}}, {'name': 
'wikibase-validator-sitelink-conflict', 'parameters': 
['[https://commons.wikimedia.org/wiki/Category:Media_contributed_by_Dublin_Public_Library
 commonswiki:Category:Media contributed by Dublin Public Library]', 
'[[Q104440260|Q104440260]]'], 'html': {'*': 'Site link <a class="external text" 
href="https://commons.wikimedia.org/wiki/Category:Media_contributed_by_Dublin_Public_Library";>commonswiki:Category:Media
 contributed by Dublin Public Library</a> is already used by item <a 
href="/wiki/Q104440260" title="Q104440260">Q104440260</a>. Perhaps the items 
should be <a href="/wiki/Special:MyLanguage/Help:Merge" 
title="Special:MyLanguage/Help:Merge">merged</a>.  Ask at <a 
href="/wiki/Wikidata:Interwiki_conflicts" title="Wikidata:Interwiki 
conflicts">d:Wikidata:Interwiki conflicts</a> if you believe that they should 
not be merged.'}}];
     help: See https://www.wikidata.org/w/api.php for API usage. Subscribe to 
the mediawiki-api-announce mailing list at 
&lt;https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce&gt; for 
notice of API deprecations and breaking changes.]
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "catdpla.py", line 51, in <module>
        item.editEntity(data, summary=u'Create new Wikimedia Commons category 
item.')
      File "/srv/paws/pwb/pywikibot/page/__init__.py", line 138, in wrapper
        handle(func, self, *args, **kwargs)
      File "/srv/paws/pwb/pywikibot/page/__init__.py", line 130, in handle
        raise pywikibot.OtherPageSaveError(self, err)
    pywikibot.exceptions.OtherPageSaveError: Edit to page [[wikidata:-1]] 
failed:
    failed-save: The save has failed.
    [messages: [{'name': 'wikibase-api-failed-save', 'parameters': [], 'html': 
{'*': 'The save has failed.'}}, {'name': 
'wikibase-validator-sitelink-conflict', 'parameters': 
['[https://commons.wikimedia.org/wiki/Category:Media_contributed_by_Dublin_Public_Library
 commonswiki:Category:Media contributed by Dublin Public Library]', 
'[[Q104440260|Q104440260]]'], 'html': {'*': 'Site link <a class="external text" 
href="https://commons.wikimedia.org/wiki/Category:Media_contributed_by_Dublin_Public_Library";>commonswiki:Category:Media
 contributed by Dublin Public Library</a> is already used by item <a 
href="/wiki/Q104440260" title="Q104440260">Q104440260</a>. Perhaps the items 
should be <a href="/wiki/Special:MyLanguage/Help:Merge" 
title="Special:MyLanguage/Help:Merge">merged</a>.  Ask at <a 
href="/wiki/Wikidata:Interwiki_conflicts" title="Wikidata:Interwiki 
conflicts">d:Wikidata:Interwiki conflicts</a> if you believe that they should 
not be merged.'}}];
     help: See https://www.wikidata.org/w/api.php for API usage. Subscribe to 
the mediawiki-api-announce mailing list at 
&lt;https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce&gt; for 
notice of API deprecations and breaking changes.]
    CRITICAL: Exiting due to uncaught exception <class 
'pywikibot.exceptions.OtherPageSaveError'>

TASK DETAIL
  https://phabricator.wikimedia.org/T270917

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Dominicbm
Cc: Aklapper, pywikibot-bugs-list, Dominicbm, JohnsonLee01, SHEKH, Dijkstra, 
Khutuck, Zkhalido, Viztor, Wenyi, Tbscho, MayS, Mdupont, JJMC89, Dvorapa, 
Altostratus, Avicennasis, mys_721tx, jayvdb, Masti, Alchimista, Rxy
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