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Thread necro, but same advice applies. Unfortunately, Smart Moving support has never been "good", but now will be even worse. Within the past few days, the mod author's MinecraftForums.net forum account and all of the posts from that account became victims of a purge that deleted roughly 1 million accounts and 10 million posts. Unfortunately, there was never any documentation outside of those forum posts, which means mod authors aren't as likely to add support now. There was someone working on a fork of it, but nothing has been touched in the past 8 months.

Don't send people to github if you haven't found the cause of the issue it's just spamming the site with useless crap. His post says he's getting a error calling a client only method. DO NOT CALL CLIENT ONLY METHODS ON THE SERVER. Your log CLEARLY disagrees with the function you're stating is the issue. So you don't even know what function you're trying to call. Debug here BEFORE posting on github.

Don’t use names, use UUIDs, and you probably want to `break` on success

I believe that FontRenderer has an constant integer value called "white" or something. Alternatively you could use the value that is hardcoded into every GUI which is 4210752 (0x404040). You could also use a hex color picker (just google "hex color picker"). You can also just write in your colour - the first 2 bytes are red, the second 2 bytes are green & the last 2 bytes are blue. So pure red is 0xFF0000, pure green is 0x00FF00 and pure blue is 0x0000FF.