Ember Uncaught (in promise) ReferenceError: finalDescription is not defined

I get this error upon sending a request with my async function. I also tried passing in finalDescription into the async function, but no luck.

My application.js

 @tracked finalDescription;

  @action getDescription(description){
    this.finalDescription = description;

  }


@action async sendRequest() {
    const cron_minutes = finalSchedule[tag].toString();
    if (finalDescription[colour].length) {
      mystring = mystring + "/" + finalDescription[colour].toString();
    }

    ...

and description looks like this

description = {
    colour: [1,2],
    tag: [32,34,36],
    era: ["modern"],
}