Deleted Featured Image – Now Getting Errors

I am a high school teacher and I’m building a website for my online students. Initially, I deleted the “featured image.” Now, I’m adding blocks, and when I click the “Featured Image” button, I get an error. The error states the following:
The editor has encountered an unexpected error. Attempt Recovery Copy Post Text Copy Error

The copied post text is:

<!-- wp:paragraph {"align":"center","fontSize":"large"} -->
<p class="has-text-align-center has-large-font-size">Select your class below to get started.</p>
<!-- /wp:paragraph -->
TypeError: d.media is not a function
    at new s (http://chipmanbiology.com/wp-includes/js/dist/media-utils.min.js?ver=9ad24b42cc69f241229ded4dc61409fb:2:6432)
    at Ag (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:63:107)
    at Vg (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:89:442)
    at ph (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:217:70)
    at lh (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:126:409)
    at O (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:121:71)
    at ze (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:118:14)
    at http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:53:49
    at unstable_runWithPriority (http://chipmanbiology.com/wp-includes/js/dist/vendor/react.min.js?ver=16.9.0:26:340)
    at Ma (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:52:280)

The copied error is this: 
TypeError: r is not a function
    at http://chipmanbiology.com/wp-includes/js/dist/components.min.js?ver=2152e06558875aa948807b6ffd5da769:7:394727
    at Vb (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:104:431)
    at Xi (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:151:136)
    at unstable_runWithPriority (http://chipmanbiology.com/wp-includes/js/dist/vendor/react.min.js?ver=16.9.0:26:340)
    at Ma (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:52:280)
    at Yb (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:150:420)
    at Ae (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:118:178)
    at xi (http://chipmanbiology.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:39:146)

The only way to be able to edit again is by clearing my cache. Any help would be appreciated.

• This topic was modified 5 years, 6 months ago by Steven Stern (sterndata).
• This topic was modified 5 years, 6 months ago by Steven Stern (sterndata).

The page I need help with: [log in to see the link]