Vulnhub的恨多靶机都是 OVA格式的文件 启动不了怎么办呀。。。

启动提示如下:
Network boot from Intel E1000
Copyright (C) 2003-2018 UMware, Inc.
Copyright (C) 1997-2000 Intel Corporation
CLIENT MAC AdDR: 00 0C 29 E2 42 27 GUID: 564D326A-5dd6-6E3A-6D7B-10219BE24227
PXE-E53: No boot filenaMe received
PXE-MF: Exiting Intel PXE ROM.
Operating System not found