This is the correct location of the hermitage. The location is incorrect on the maps.
Location: Santa Maria La Nova di Campagna (SA)
What remains of the hermitage of Sant’Erasmo and San Giacomo degli Eremiti (Ruins of a rock monastery – 12th century) is located near a cave at 860 meters above sea level, on the eastern side of Mount Ripalta near the Palmentara valley. Although documented starting from 1192, the historical story of the Benedictine rock monastery is rather fragmentary and we only know that, due to a dispute that broke out within it, a good part of the monks decided to abandon it to go and found the nearby church of Santa Maria La Nova in 1220.
To reach the hermitage, trekking clothing, sturdy shoes, gloves and a fair amount of mountaineering experience are essential.