Since you got up to 97% this means the data cloning has completed and the failed part is the reconfiguration of the resulting machine in order to make it bootable. This is done by the helper service. You can export a log bundle of the failed task and then dig into the archive until you get to vmware-converter-helper.log. There you can find more information about what Converter was doing at the time of failure and possibly more detailed error info.
Since the data is there you can try to repair your destination VM manually. Converter includes four steps in this process
1. Repair GRUB boot loader (incl. patching the menu.lst file)
2. Repair /ets/fstab paths
3. Rebuild initrd image
4. Fix network files
There are detailed steps in other posts for fixing any of these.