Not able to build a pluggable web widget in Mendix

Hi, I am following Build a Pluggable Web Widget: Part 1 - Studio Pro 9 How-to's | Mendix Documentation for building a pluggable web widget but i got stuck at step no.3.3 as after building widget when i am running npm start in command prompt i am getting following error -Could anybody help me on this?
1 answers

What version of Node are you using? The current recommended version is 14 I believe, which is behind the current the LTS version.