Fatal error: Out of memory

I'm getting the following when I click on a coupon to edit a coupon:
Fatal error: Out of memory (allocated 154664960) (tried to allocate 71 bytes) in /home/isobeaut/public_html/administrator/components/com_awocoupon/views/coupon/view.html.php on line 236

Virtuemart version: 1.1.6
Joomla: 1.1.15
AwoCoupon Pro: 1.4.6

The server recently upgraded to php 5.3
Also the memory_limit was raised to 147.5 Mb

Thank you

Do you have alot of products or users? If so, this may be the problem as it is trying to load everything when you open the page. If that is the case, upgrade. The latest version has been rebuilt with this problem in mind, and does not load everything on initial load of the page.