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After Exporting a CSV File the server shows Error 502 Gateway Nginx Ruby On Rails

When i try to export a csv file from server. The server just went down and it shows 02 bad gateway.

I have checked the error log of nginx server

OOM Error Occured:

Tried Swapping Off and then On . Nothing Worked

Restarted the instance on AWS Instance still not worked.

Running Ruby On Rails With Nginx. Any suggestion would be appreciated.