Issue with Wordpress Theme Personalization (ResumeX)

My Themeforest theme, ResumeX has been giving me an issue in the backend of my wordpress site but the author of this theme has been MIA for some time. Essentially when I go to personalize my “About” section (or any sections) in the theme settings on the backend, I’m just getting a blank white screen with no options. I have limited knowledge of web development, so hoping I can find someone that can help me fix this in absence of the author of this theme as I really don’t want to have to completely change my theme.

My website is for reference.

You can contact me to discuss the details, I’d be happy to help you on this project