Hi there,
I would ask you toreview this post for future reference. Providing folks with enough information is necessary in order to ensure that your thread does not remain unanswered forever.
As far as your specific problem. Exit code 137 indicates that your build is running out of memory. We have a couple troubleshooting steps outlined here: https://support.circleci.com/hc/en-us/articles/115014359648-Exit-code-137-Out-of-memory