Hey, I just discovered this project and decided to give it a shot - I just got the same error on server while running 4.2.0 and was able to workaround it by changing "locale" to "en_US"

Should be fixed in 4.2.0 https://github.com/superzanti/ServerSync/releases/tag/v4.2.0

Originally posted by @rheimus in #266 (comment)

Interesting, the fix for this appears to have gone walking down to the pub.

🤷‍♂️ I'll add it back in again.