Customization Broke My Theme

I was using the Customization feature for my theme (in Edge, which may be the issue)

After making a very minor change, just changing one of the words in the boxes, I can no longer access my site, nor can I access the customization options. When I try to access my site, I get:

PHP Warning: strpos() expects parameter 1 to be string, array given in C:\Inetpub\vhosts\insightvillage.ca\httpdocs\wp-includes\shortcodes.php on line 191
PHP Warning: preg_match() expects parameter 2 to be string, array given in C:\Inetpub\vhosts\insightvillage.ca\httpdocs\wp-includes\shortcodes.php on line 202

When I try to access the customization page, I get:

PHP Warning: htmlspecialchars() expects parameter 1 to be string, array given in C:\Inetpub\vhosts\insightvillage.ca\httpdocs\wp-includes\formatting.php on line 3438

I can access the rest of my site, though it looks wrong now. I also can access the rest of my dashboard.

I tried deleting and reinstalling the theme, hoping that would fix it, but it didn’t.

My site is http://www.insightvillage.ca

Please help. I really need my site back up.