The Latin word “errore” is ued in Pastor Aerternus (1870 A.D.)
I don’t think a reference to Pastor Aeternus really answers brother Don’s concern. Though there are considerations from it that can be applied,
To satisfy this pastoral office, our predecessors strove unwearyingly that the saving teaching of Christ should be spread among all the peoples of the world; and with equal care they made sure that it should be kept pure and uncontaminated wherever it was received. It was for this reason that the bishops of the whole world, sometimes individually, sometimes gathered in synods, according to the long established custom of the churches and the pattern of ancient usage, referred to this Apostolic See those dangers especially which arose in matters concerning the faith. This was to ensure that any damage suffered by the faith should be repaired in that place above all where the faith can know no failings. The Roman Pontiffs, too, as the circumstances of the time or the state of affairs suggested, sometimes by summoning ecumenical councils or consulting the opinion of the churches scattered throughout the world, sometimes by special synods, sometimes by taking advantage of other useful means afforded by divine providence, defined as doctrines to be held those things which, by God’s help, they knew to be in keeping with sacred scripture and the apostolic traditions. For the Holy Spirit was promised to the successors of Peter not so that they might, by His revelation, make known some new doctrine, but that, by His assistance, they might religiously guard and faithfully expound the revelation or deposit of faith transmitted by the apostles. Indeed, their apostolic teaching was embraced by all the venerable fathers and reverenced and followed by all the holy orthodox doctors, for they knew very well that this see of St. Peter always remains unblemished by any error, in accordance with the divine promise of our Lord and Saviour to the prince of his disciples,
The blue highlight above represents the portion that is actually analogous to the statement by St. Cyprian. The red highlight above represents a portion that is analogous to St. Ignatius’ statement.
Still, as mentioned to brother Don earlier, the CONTEXT of the letter is sufficient to indicate that “perfidy” is equivalent to “errors.” St. Cyprian was writing against the intrusion of a group into Rome that he believed to be in theological error. His argument was basically an argumentum ad absurdum. How can these schismatics/heretics pretend to (1) install a bishop that represents a schism into the See which is the seat of priestly unity, and (2) introduce their errors into the See in which no errors can have access.
Blessings,
Marduk