How can I successfully install a VAST JS tag in fluid player and node.js when facing difficulties?

In my case, I am trying to enhance video advertising capabilities by embedding a VAST (Video Ad Serving Template) tag into Fluid Player, a popular video player library. Despite following the documentation and various online tutorials, I find myself stuck with errors that prevent successful integration.

This integration is crucial for my project, as it aims to streamline video ad delivery and tracking. What steps should I take to diagnose and overcome these integration issues, ensuring the VAST tag works seamlessly with Fluid Player in my Node.js application?