Upgrade validation results in "Failed to verify the signatures of the image."

Failed to verify the signatures of the image. The image may
have been corrupted. Replace the image, and then try the command
again., Action: Use the "cluster show" command to verify that all
nodes in the cluster are healthy. Use the "cluster image package
show-repository" command to verify that the downloaded image has
the correct version. If all nodes are healthy and the image has the
correct version, wait a few minutes, and then use the "cluste
image resume-update" command to resume the update.           

Example: 

system node image update -replace image2 -node node1 -package http://Web_server/97P5_q_image.tgz -setdefault true

Warning: The recommended best-practice is to use the automated non-disruptive update procedure if you are attempting an      upgrade or a minor version downgrade. Refer to the Clustered Data ONTAP Upgrade and Revert/Downgrade Guide for details.

Do you want to continue? {y|n}: y

Software update started on node node1. Updating image2 with package   http://.../97P5_q_image.tgz.
Downloading package. This may take up to 20 minutes.
98% downloaded
Download complete.
Listing package contents.
Decompressing package contents.
Verifying package signature.
Install Failed.
Failed to verify the signatures of the image. The image may have been corrupted.
Replace the image, and then try the command again.
Error: command failed on node "netappnode01-dr": Install Failed. Failed to verify the signatures of the image. The image may have been corrupted. Replace the image, and then try the command again.