hector feature_stats killed

[CFCl-BrI]

Hi,
When I ran the script model_train_demo.sh on the provided virtual machine on VM VirtualBox, I got an error:
model_train_demo.sh: line 5: 1921 Killed hector feature_stats --indexes ~/dataset/CWE190/indexes-190.json --depth-limit 40 ~/dataset/CWE190/CWE190_augLabels_clean_0.1_1.0.json.gz
I know that it means that the VM has run out of memory, but I have no idea about how to solve it. How much memory does this command need? My computer has 16GB internal memory, and the virtual memory of the virtual machine has been set to more than 10GB. Is there anything I missed or misunderstood, or anything I can do?
thanks!