Grub doesn't launch windows10 (1803) : invalid signature . .

I newly started manjaro
I create a 8GB swap on /dev/sda6
and about 130 GB ext4 partition on /dev/sda7 and set mount point on “/”
I set mount point of /dev/sda2 as /boot/efi
and install finished
Wnen grub wants launch I see :
Grub loading.
welcome to grub !

error : file ‘/boot/grub/i386-pc/normal.mod’ not found
Entering rescue mod . . .
Grub rescue>

than I launch my manjaro flash boot and I selected “detect efi bootloaders” and I selected first option [(hd3,gpt2)/efi/boot/bootx64.efi]
Then grub launched and there were manjaro and windows (and windows correctly booted) I selected manjaro and manjaeo launched for first time , I launched terminal and run this command: “sudo grub-install --target=i386-pc /dev/sda”
Then I rebooted and grub shown but when I select “windows boot manager (on sda2)” I see this error :
error : invalid signature.
Press any key to continue . . .

My windows 10 version is 1803
What should I do to launch windows from grub?

Try this:

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