" Allowed memory size of 268435456 bytes exhausted" on saving catalog price rule

I am using Magento EE 1.14.2, In that admin panel, trying to create a new rule in Catalog price rule section, I am getting the blank screen and getting the error message in the server log

"PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 32 bytes) in /var/www/html/qa/api/lib/Varien/Object.php on line 344, referer: http://mywebsite.com/index.php/admin/promo_catalog/edit/id/7/key/88744b20d5b8d781573a45e2e9db922808be5065e18e2bf52b 7b019b2dbd1ee1/"

Please let me know what will be issue, why is showing memory exhausted. Already memory increased to 1024 MB.


Awaiting for your reply

in this error comes by loading more memory to handle php in one time, kindly follow this URL you can get idea to solve this issue

https://www.airpair.com/php/fatal-er...ed-memory-size