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Unable to import OVA file into AWS

I am trying to import a OVA file exported from my on-premise VMWare setup. This Linux virtual appliance (in VMWare it shows OS as Other 3.x Linux 64 bit) is running fine on my environment. I uploaded the OVA file to a S3 bucket and followed the instructions given in AWS documentation to create policy and role. However when I try to run the command to convert this to a AMI, I get the error ClientError: Unable to find an etc directory with fstab. This is the status I get when I run aws ec2 describe-import-image-tasks --import-task-ids import-ami-<request id>. I am unable to find what is wrong here. Has anyone faced similar issue?