Blank page while rendering Meteor app on Google Chrome

I’ve just started using Meteor and I am following this leaderboard tutorial. It’s a little outdated, though, but I do my best to solve problems.

Unfortunately, I get the blank page on both Google Chrome and Microsoft Edge. I solved every problem that came out ont he way. And now, I have no errors but blank page, however tha main.html file looks as below:

  {{> leaderboard}}

<template name="leaderboard">
  Hello World

Please help. I can’t think of what causes the problem and I am stuck.