E-commerce Website Debugging & Maintenance

I've launched my E-commerce website but it encounters an error when I run 'npm start'. I need someone to troubleshoot and fix this issue for me. It might be related to my Windows system. I'm not very tech-savvy and would appreciate a professional who can maintain the site for me in the long term.

Please follow these steps:
- Download the attached code from the Dropbox link and check if you can run 'npm start' successfully.
- If it doesn't work, please debug the problem and fix it.

The ideal freelancer for this project should:
- Have experience with E-commerce websites
- Be proficient in debugging and maintaining code
- Be familiar with Windows operating system

Please check the files before applying, and let me know if you can help. I look forward to starting a long-term cooperation.