htacess made website crash. Backup doesn't fix it.

I was trying to enable browser caching on my website, so I entered the following code in my .htaccess file

## EXPIRES CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType text/html "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>
## EXPIRES CACHING ##

When I updated it using fireftp, it caused the entire site to go blank. I then tried to replace it with the backup .htaccess I had created, and the problem remained. What am I doing wrong? Why does the backup version not work when it was working previously?
This is a link to my website