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Try if the following will output something:

  
zcat -f /var/log/nginx/error.log*.gz | grep "2017/04/27"
  

If there's output, then try:

  
zcat -f /var/log/nginx/error.log*.gz | grep "2017/04/27" | goaccess -p /opt/goaccess-errorlog.conf -a > /tmp/fe1_error.html
  

If ever there's still no output, try adjusting the date (your cron script might already deleted logs dated you are trying to access).