JavaFX Program Runtime Exception Fix

I'm seeking a Java expert to assist me in resolving runtime exceptions in a JavaFX program I'm trying to run on my Windows system.

Key Tasks:
- Identify the root cause of the runtime exceptions.
- Provide a fix to the runtime exceptions so the program runs smoothly.

Ideal Skills:
- Proficient in Java programming.
- Strong understanding of JavaFX.
- Experience with debugging and resolving runtime errors in Java programs.
- Knowledge of Windows operating system.

I will provide all necessary code and error logs for your reference. Looking forward to your expertise in fixing this!