title: Highcharts area-spline fill gradient possibly undefined error
body: <p>So I'm working with highcharts on angular 12 and trying to fill the area spline color with a gradient and I'm getting this error any idea how to solve this or what I could possibly be doing wrong ?</p>
  <p>Any help would be appreciated ,Thanks in advance</p>
  <p><a href="https://i.stack.imgur.com/fzEuZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fzEuZ.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/XbQFg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XbQFg.png" alt="enter image description here" /></a></p>