开发板挂载nfs失败

开发板挂载nfs失败

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root@100ask:/# mount -t nfs -o nolock,vers=3 192.168.100.240:/home/book/nfs_rootfs/ /mnt

mount: /mnt: bad option; for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount. helper program.

你好,我也出现了这个问题。请问你是怎么解决的呀?