Somehow I fixed the problem.
I read that you should add this text to the htaccess file but then that it was the same location as the wp-config.php file, so I added it to the wp-config.php file.
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule . index.php [L]
I GOT ANOTHER ERROR MESSAGE….. SO I WENT BACK AND DELETED THIS CODE.
As soon as I deleted the code, for some strange reason, it worked.
Thanks for your offering assistance until the problem was resolved.