Yeah, so where's the part about being free from error? Why does the New Testament teach that we must be on guard against error if we're automatically protected from it?So do the teachings about selling indulgences still stand? What about the other documented errors taught by the church through the centuries?
Your church's claim about being free from error is its biggest error.
If He is with us, error is not. But error is constantly appearing from jumped up, self appointed experts who think they have access to the truth, but don't. They have a long pedigree, beginning with the Arians and Nestorians. The heretics have been amongst us from the beginning, and it has been the ongoing job of the Church ("my" Church) to correct their errors.
So do the teachings about selling indulgences still stand?
What teaching? That such behaviour is sinful? The "selling" of spiritual goods has been consistently condemned, by my Church, since Apostolic times. So yes, those teachings still stand.
The so-called documentation is in error.