Maybe you removed one of your snapshot files manually from datastore before execute consolidation operation, is it happened?
Consolidation will merge the VM’s snapshot replica VMDK files so you need to have them all in parent-child structure. If you removed their file it’s posible to fail consolidation.
Otherwise you need to have enough space in your datastore to run consolidation
Please mark my comment as the Correct Answer if this solution resolved your problem
To see the full content, share this page by clicking one of the buttons below