Sounds like the addon has been hit by some of the Dragonflight UI changes. Some of which were added to Wrath Classic.
SetMinResize doesn't exist as a Wow API Command/Function.
However, this function may do similar.
https://warcraft.wiki.gg/wiki/API_Frame_GetResizeBounds
Hopefully it's the only error you will get, but don't be surprised if more turn up if this fixes this one.