Due to a manufacturing error, two flags were actually produced.

In most cases, the defect is due to physical abuse or a manufacturing error.

Shortly after the Salk vaccine came into use, a manufacturing error left live virus in one batch.

The effect of stress concentration and manufacturing error are neglected.

Moreover, if a defective part is spotted, the manufacturing error is corrected instantly.

The finding all but pinned down the cause of the problem as a manufacturing error rather than a design flaw.

His claim was later confirmed as the result of a manufacturing error.

However due to a manufacturing error the original version was released instead.

Hexachlorophene (6.3%) was added to "baby powder" in France due to a manufacturing error.

There's no problem with this, no manufacturing errors.