Problem creating a dexterity Link object

Hi all.
I'm trying to create a new dexterity Link object using plone.api methods.

few days ago all works fine and I'm not able to understand what we have
changed, but right now i get this error:

http://pastebin.com/MhU4Zrfb

Caller code it's something like:

        if missing:
            link = api.content.create(folder_obj, 'Link',
title=self.context.Title())
            if self.context.portal_type in self.use_view_action():
                to_link = to_link + '/view'
            link.remoteUrl = to_link
            link.reindexObject()

someone has some hint to debug this problem ?

Thanks
   Luca

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