Jetpack Fatal Error Allowed Memory DreamPress

I am using DreamPress. When I try to connect the Jetpack plugin to WordPress I get the following error:

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 72 bytes) in /home/wp_fwcfna/ on line 29

I also get that error when I try to login to WordPress, meaning I can’t access WordPress, edit my site or anything.

I have tried the main suggestion I have found from the WordPress forums, which is to add the following to my wp-config.php file:

/** Memory Limit */
define(‘WP_MEMORY_LIMIT’, ‘256M’);

I added that and it didn’t help. Has anyone who is using DreamPress had this same error? Or any suggestions on how to get this fixed in a way that will allow me to use Jetpack?

I can FTP into my site and delete the Jetpack folder, which then allows me to access WordPress, but as I said I would like to be able to use Jetpack.