shotgun | A simple EventMachine-based asynchronous webserver

I'm trying to start Shotgun for a Sinatra app after having upgraded to Ruby 3.0.1, and get this:

I am trying to develop a simple game using nw.js (node.js + chromium page).

1. I'm calculating distance between people like below:

I am currently practicing making a simple website. I have a problem in the navigation bar above my website. When I scroll further down my website, their color when I hover and their responsiveness disappears. Here's a pic to help you understand my problem.

I don't know if I use some codes right but here's my code, you can leave a tip or you can also add on how the code works so I can correct my mistake.

Hello dear colleagues,

First thing first, this is my first time I'm asking a question here so I hope I'll be clear. I'm currently facing some challenges when dealing with a lot of dataframes with variable lengths and non-regular colnames. The challenge is to remove unwanted rows (here rows for samples sequenced as Whole genome shotgun sequencing) matching multiple keywords, indeed it would we to easy to have a single keyword ... For that purpose I'm unsing filter_all(any_vars(str_detect(., "WGS")). However, trying to negate the code with negate=T or !str_detect() return the whole dataframe and nothing seems to work. Using all_vars() remove every rows in the df. I came around a solution but I find it quite heavy and I'm pretty sure there is a better way to perform this :

Situation: I have a function, I want to have a child with only one different default parameter. Is it possible to not rewrite every parameters and only the one that I want to change ?

When I run 'rake db:migrate' it won't generate the schema.rb file. I ran almost every rake command already but it didn't change anything yet. Anyone, please? I'm still pretty new at this. Here are some files that may be helpful:

My Gemfile:

I have a reference genome containing the following headers (lines starting with >) that I would like to be renamed to simply the digit/letter of the chromosomes. I would like a sed statement to do this systematic replacement, but I am new to sed. Elsewhere in the file are additional headers that should be unchanged, and the genetic sequences between the headers should remain unchanged.

Pls find a way to fix it :/ I'm not really good at scripting stuff.
There is another script: Server script. But i don't think it's the cause of this problem.
I will post it anyways

Btw it's for a shooter game that I'm making (just to add some workds soo i can post it)

When it breaks it send's out this: