[Solved] error 'Could not resolve host:' after creating article

Hello
We are working on JFBConnect configuration on our webpage to be able to push articles from one category to fb. It is fresh install in newest version of the component.
We manage to create channel and successfully connect with fb. We created Open Graph object and linked it to the channel. All seems good until this step. But now when we try to create article we get message that article cant be saved because 'Could not resolve host:' and name of our domain. What is interesting is that article is created in joomla but it is not pushed to FB,
I tired to look for solution but no luck so far.
What can a be reason for this error?

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The problem was error in domain configuration