Well yes, the original texts were inerrant, but as some would point out, we don't have them around any more, only copies which seem to agree with each other based on interpretation of their respective words that they contain.
This is where the doctrine of the divine preservation of Scripture comes in. A superabundance of manuscripts (copies of copies of copies) exists in both Hebrew and Greek, and textual scholars have collated many of them and found them to agree (barring minor discrepancies).
Moses began writing the Torah around 1500 BC, but as far as the Lord Jesus Christ was concerned, the Hebrew scrolls (which were copies) He used on earth had remained unchanged during all that time. Therefore He gave His stamp of approval to the Tanakh (Hebrew Bible with 24 books) then in existence. And the Tanakh does not have the Apocrypha.
What has been established is that faithful traditional (handed down) texts of both the Hebrew and Greek manuscripts have been in use ever since the Bible was completed. Reformation Bibles were based on these texts (after the invention of printing and the production of printed Hebrew and Greek texts).
A good example is the Isaiah scroll found with the Dead Sea Scrolls (discovered between 1946 and 1956). While this Isaiah scroll was dated around 200 BC, it was found to be replicated almost verbatim in the Masoretic Text (dated around 900 AD). So even after a gap of over one millennium, Scripture had not changed. This was an amazing confirmation of the doctrine of divine preservation.
Christians should be totally confident that their Bibles (based on the traditional texts) have absolutely no errors. If a Hebrew scribe made an error while copying, he destroyed his handiwork and started afresh. The monks who copied the New Testament manuscripts were equally diligent.