This method was removed in 7.2, and I believe it is the source of a couple issues posted here.
https://wowpedia.fandom.com/wiki/API_GetEquipmentSetInfoByName

If people have bars that include equipment slots loading them causes a runtime error.

Also there is a call to PickupEquipmentSetByName which is similarly removed in favor of picking up the set by Id, so it seems like a bit of a rewrite is needed.

Seems to be the cause of:
#4
#23