A bug in SequenceServer

While Configuring SequenceServer-2.0.0 in my ubuntu system, I received this message saying: Looks like you have encountered a bug in SequenceServer. PLease fix this issue for me.

thanks @abc123 - for anyone to be able to help, I think we’ll need a bit more information about how this appeared, what versions of ruby etc you are running. We ideally need a reproducible example (minimal dataset, steps you took, etc)
I would also recommend using 2.2.0 as that is the latest release. If I recall correctly, 2.0.0 runs on a version of ruby that is no longer officially maintained.
Kind regards,