I am seeing the following error message on Wow Classic Era.

Message: Interface/AddOns/Open-Sesame/Open-Sesame_Vanilla.lua:233: attempt to call global 'GetContainerNumSlots' (a nil value)

The addon is no longer opening any containers. Any suggestion on how to resolve it?

PR waiting with fix for this

Great to hear, much appreciated!

Oh, looks like there has been an API change:
https://us.forums.blizzard.com/en/wow/t/api-replacement-for-getcontainernumslots/1404085

C_Container.GetContainerNumSlots

Most of the container calls got pulled into C_Container.

correct, era API is merged in most things with wrath/dragonflight now. i will push an update soon

I hope a fix is in the works. Really miss this great addon.