errata:
Row 2 should read, Ch 1, 2 sc in first dc, 1 sc in next dc, 1 sc in ch, 2 sc in next dc, sc in each rem ch and dc, working last sc in 4th ch of beg ch.

Row 69 should read, Ch 4, dc in next sl st, (ch 1, dc) in next 46 sl sts, dc dec (see Stitch Guide) in next ch and sl st twice, turn. (50 dc, 47 chs)

Video help
https://youtu.be/9RC7jlTEHcE