Need help - Cannot read property 'getFirstTick' of null

Hello, I’m using this tutorial to create my first game alongside with vue.js. I found a boilerplate that i use. I have a problem with animations on the controls ( Part 7). The player moves without this.player.anims.play but with it i get this error Uncaught TypeError: Cannot read property ‘getFirstTick’ of null.
Does anyone know why this is happening and how to fix it?
Here is a link to the project in github: vue-phaser3-game

key is misspelled as kay in two places.