We will need much more information to discuss this. We can start by knowing:
What version of progeCAD are you working with?
What version of Windows are you working with?
How much RAM do you actually have on your PC/laptop computer?
Does the error occur with every drawing (even A new one) or just one or two specific drawing?
As a note concerning out-of-memory errors it is a good idea to check the Processes list of your Windows Task Manager and sort the list by memory usage (click on the memory column header) to find out what is using memory and how much it is using.
Also, what is your cache memory configuration (static/auto/disabled)?
progeCAD support, tips and troubleshooting forum. progeCAD works very similar to some versions of AutoCAD. Moderated.