NTFS signature is missing?

Whenever I want to execute mount, the following question will be displayed.and I installed ntfs-3g package.

NTFS signature is missing.
Failed to mount '/dev/mmcblk0p48': Invalid argument
The device '/dev/mmcblk0p48' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

What kind of problem is this?

If you mount filesystem without an exact system name it checks one by one - and if it's not ntfs, this is what it prints.

mount by adding -t option, ex mount -t ext4 /dev/...

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Do you really have an NTFS on that block device?

I downloaded it from the openwrt web