Now, drag your mouse over the Preferred Size and then type in a higher figure. You can always add more later. Having lots of physical memory is one of the easiest ways to keep your applications happy. The cost of ram at the present time is certainly conducive to adding more memory to one's system. Then, whenever a new application is installed, one can immediately up the memory allotted to it.
Applications run quicker with more memory and are less likely to generate errors.
Another thing to consider when trying to solve memory errors is when did the message come up. Had you been using different programs over a long time period or had you just recently booted up and opened an application when it happened. If the former is the case, your program may be prone to corrupting memory. A simple restart will mostly likely correct the problem. Corrupted preferences may also be at the bottom of your problem.