Error when updating theme

Hi,

I get this error when I try to update Enfold on http://www.santamonicahotelbooking.com
What do you think is wrong? I have added a login for you.

Thanks
Charlotte

Downloading update from https://s3.amazonaws.com/marketplace-downloads.envato.com/files/140862862/enfold.zip?AWSAccessKeyId=AKIAJYG5ROGJ6X7Z3M6Q&Expires=1437053983&Signature=cj%2FOKMCR7A3KbkmC2PkQqNaFgZY%3D&response-content-disposition=attachment%3B+filename%3Dthemeforest-4519990-enfold-responsive-multipurpose-theme-wordpress_theme.zip…
Unpacking the update…
Installing the latest version…
Removing the old version of the theme…
Theme update failed.

Attention: We detected some custom styling rules in your custom.css file but could not restore it. Please open the file yourself and add the following content:
/* Have fun adding your style here :) – PS: At all times this file should contain a comment or a rule, otherwise opera might act buggy :( */

/* General Custom CSS */

/*
Desktop Styles
================================================== */
/* Note: Add new css to the media query below that you want to only effect the desktop view of your site */

@media only screen and (min-width: 768px) {
/* Add your Desktop Styles here */

}

/*
Mobile Styles
================================================== */
/* Note: Add new css to the media query below that you want to only effect the Mobile and Tablet Portrait view */

@media only screen and (max-width: 767px) {
/* Add your Mobile Styles here */

}

.av-inner-masonry, .av-inner-masonry * {
transform: none !important;
transition: none 0s ease 0s !important;
}
.av-masonry-date { display: none !important; }

#top .social_bookmarks {
font-size: 17px !important;
}
#main {
font-size: 14px !important;
}