Memory fault error when running simulation with adaptive pass in CST

I can simulate a structure in CST without adaptive pass successfully. But when I run adaptive pass, sometimes, the program will have memory fault error such that I am forced to abort the simulation or the program hangs and I need to re-start the program. Does anyone have any idea why this happens?

The adaptive mesh algorithm increases the density of the meshcells and solves the model until it meets the desired error criterion.
The model preperation part of the solver requires a huge amount of memory.
In my opinion, your computer crashes during the solver part - "Model preparation".
Follow the solving process to see if its right. if so, you should consider getting more memory.
Cheers,
P.