Can you help me understand the problem with the attached image?

[lucasdomonte]

Can you help me understand the problem with the attached image?

 

[Unique_Eric]

Out of memory so start killing processes?

 

[lucasdomonte]

When I was giving the error, I entered the command "free -h" and had 8 GB of free memory.

 

[Unique_Eric]

https://unix.stackexchange.com/questions/282155/what-is-the-out-of-memory-message-sacrifice-child
Couldn't tell more, that is the message means.