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So, The error message you reported, mostly comes when you downloaded the ready cloud images with img extention and convert it into qcow2, when they are already having that format. Here are details of Openstack Disk and Container formats

For Example:

# qemu-img info RHEL64.img
image: RHEL64.img
file format: qcow2
virtual size: 5.0G (5368709120 bytes)
disk size: 136K
cluster_size: 65536

You can directly upload that ready cloud image file to Glance, no need to convert. You can refer this documentation

#glance image-create --name='RHEL64-TEST' --is-public=true --container-format=bare --disk-format=qcow2 < RHEL64.img

Please let us know if this solution works.