Request_Id Variable unknown?

[iridude at aol.com]

I am using Nginx version 1.10.2 and get the following error:

Unknown “request_id” variable

This is in nginx.conf:

Log_format main ‘$remote_addr - $remote_user [$time_local] “$request” $status $body_bytes_sent “$http_referer” “$http_user_agent” - $request_id’;

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