When I'd get that error, I'd reboot phone, reconnect the phone and run Unrevoked again, which worked. If you want to reflash stock, this is what I did.
Download the corresponding zip from the post linked below, rename it to PC36IMG.zip, put it on your SD cards root, and run it in Hboot after its verified. It'll ask if you'd like to do the update. Hit yes then select yes to reboot after it finishes. For me it was PC36IMG_SuperSonic_S_Sprint_WWE_3.70.651.1_Radio_2 .15.00.11.19_NV_1.90_release_161482_signed.zip
http://forum.ppcgeeks.com/cdma-htc-e...ml#post2018113