Memory Exhaustion Error

After getting the error below, I upped the value in wp-config.php to this:

define(‘WP_MEMORY_LIMIT’, ‘256M’);

Yet, the error below persists.

Would appreciate any suggestions.

Thanks,

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 1751171 bytes) in /site_url/public_html/wp-includes/class-requests.php on line 381