Website startup Error Fix and Long-term Support. Node JS

I need help debugging my website that was functioning properly, but now it shows an error when I try to launch it using 'npm start'. The issue arose without any recent changes to the source code or environment, and I lack the technical skills to fix it myself. I'm looking for someone who can assist with this immediate problem and potentially provide ongoing support in the future.

Please review the attached source code and let me know your price for this task.