I noticed this error message in my chat log when I zone into the Darkmoon Faire.
It doesn't come up in Bugsack though, not sure why but thought I should let you know. I had a look and didn't notice see other bug reports about it.

HandyNotes_Achievements Error: ...otes_Achievements\Libs/InSeason-1.1/InSeason-1.1.lua:22: attempt to call field 'GetDate' (a nil value)

This has been fixed in the v0.5.0 release. Please confirm you're using a current version. If you are current, reopen this issue.

I thought I had the latest version but it looks like I've got Version: 0.4.22.
I think what's happened is I've gone to download the latest file and then my browser has told me I already have a file with that name, so I've assume I've already downloaded it.

Can you add version numbers to the zip files please?

Can you add version numbers to the zip files please?

I'm sorry about the v0.5.0 archive being ambiguously named. It's already fixed for future releases (in commit b6f81f7).