Plesk - Php Memory Limit
Process to increase the limit of PHP Memory.
Step 1 - Log in to your Plesk control panel.
Step 2 - Go to the “Websites & Domains” tab and choose which domain you’d like to secure.
Step 3 - Click on the PHP Settings.
Step 4 - Select memory size up to 128MB.
Step 6 - Click on Apply & OK.