splunk forwarder failed to send logs from amazon linux instance

Trying to send logs to splunk server using forwarder installed on Amazon Linux instances. I am not seeing any data on splunk server. On forwarder side, I am seeing interfaces.sh related error in /var/log/splunkd.log. > ... 09-10-2019 16:04:52.161 +0000 ERROR ExecProcessor - message from "/opt/splunkforwarder/etc/apps/xxx_splunk_ta_nix/bin/interfaces.sh" cat: /sys/class/net/eth0/duplex: Invalid argument 09-10-2019 16:04:52.171 +0000 ERROR ExecProcessor - message from "/opt/splunkforwarder/etc/apps/xxx_splunk_ta_nix/bin/interfaces.sh" cat: /sys/class/net/eth0/speed: Invalid argument 09-10-2019 16:04:52.280 +0000 INFO TailReader - ...continuing. 09-10-2019 16:05:03.723 +0000 INFO HttpPubSubConnection - Running phone uri=/services/broker/phonehome/connection_xxxxxx_3D3B3E31-6E53-4D7A-AB7E-0FAF1FC62062 09-10-2019 16:05:10.007 +0000 WARN FileClassifierManager - The file '/var/log/btmp' is invalid. Reason: binary. 09-10-2019 16:05:10.007 +0000 INFO TailReader - Ignoring file '/var/log/btmp' due to: binary 09-10-2019 16:05:16.196 +0000 WARN TailReader - Could not send data to output queue (parsingQueue), retrying... 09-10-2019 16:05:22.340 +0000 INFO TailReader - ...continuing. I'm experiencing this issue with all amazon Linux servers.