Process exited with code 1 on Ubuntu server

It is said that this problem is because the memory is rang out. But I checked the server dashboard, most of the memory is available.
Server information: 4 vCPU 16 GB


The left is CPU usage and the right is memory usage.

These images are captured with DJI spark.
I need to finish a paper of drone mapping so I am a little bit anxious.
Thanks.