This is what I did:
Using an ftp program I look for this file wp-content/plugins/wp-super-cache/wp-cache.php
Then over lines 2250 and 2251 there was this code:
foreach( $meta as $key => $val )
$meta[ $key ] = esc_html( $val );
Then I commented those lines:
//foreach( $meta as $key => $val )
//$meta[ $key ] = esc_html( $val );
After, I was able to access the admin panel and I went to settings->WP Super Cache->Easy->and I selected Caching Off.
Let’s wait until the developer fix this problem.