unable to pregen the world with the DH paper plugin

I ran /dhs pregen start overworld -900 70 125 512 (blank command is /dh pregen start <dimension> <origin> <chunkRadius>) and kept getting "unknown world" as the response. also, /dh isn't recognized as a command, it just asks me if i meant /dhs, even though that's what's stated in #faq-general
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