Fix WordPress Registration Error

My WordPress site is experiencing a critical error during student registration using the TutorLMS plugin.

Details:
- Error message: "There has been a critical error on this website."
- Registration page: https://stenointhecity.com/student-registration/
- Urgent task: Need immediate assistance to resolve this issue.

Ideal Skills and Experience:
- Expertise in WordPress and TutorLMS
- Strong troubleshooting skills
- Experience with critical error resolution
- Ability to work on urgent tasks

Please only apply if you can help right now.