Error log reveals this:

[Thu Jul 11 09:02:07.943146 2024] [core:alert] [pid 2141270:tid 22895643105024] [client 183.146.13.38:46683] /home/wwwstcchicago/public_html/.htaccess: without matching section

Contents of .htaccess file:

SetOutputFilter DEFLATE

# Netscape 4.x has some problems…
BrowserMatch ^Mozilla/4 gzip-only-text/html

    # Netscape 4.06-4.08 have some more problems
    BrowserMatch ^Mozilla/4.0[678] no-gzip

    # MSIE masquerades as Netscape, but it is fine
    # BrowserMatch bMSIE !no-gzip !gzip-only-text/html

    # NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
    # the above regex won't work. You can use the following
    # workaround to get the desired effect:
    BrowserMatch bMSI[E] !no-gzip !gzip-only-text/html

    # Don't compress images
    SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip dont-vary
</IfModule>

<IfModule mod_headers.c>
    # Make sure proxies don't deliver the wrong content
    Header append Vary User-Agent env=!dont-vary
</IfModule>

Any ideas?

I am unsure of where to look within the .htaccess file for the (missing) matching section.

Thanks for the help in advance!