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ok, thank you!
After looking at the link suggested I did some tests and my problem was solved by commenting in the
rows from 274 to 276:
The file I mentioned is part of a plugin (TaxCodeAndPrivacy) that I included on my Magento. Apparently my problem was caused from that.
Comes to mind: is not there some other plugin that bothers to your Magento?
Unfortunately I have no other solutions