[ubuntu] Creating a UEFI bootable Win7 USB stick topic

I'm using winsb to create a bootable usb stick. In terminal I enter this command: winusb --install'/home/obaid/Downloads/Windows 7 Home Premium SP1 (64 Bit)/Windows.iso' /dev/sdb

It returns an error:
mkdir: cannot create directory ‘/media/winusb_iso_1423415599_8150’: Permission denied
Error occured !
Syncing...
Cleaning...
Umounting and removing '/media/winusb_iso_1423415599_8150'...
umount: /media/winusb_iso_1423415599_8150 is not mounted (according to mtab)
Umounting and removing '/media/winusb_target_1423415599_8150'...
umount: /media/winusb_target_1423415599_8150 is not mounted (according to mtab)

I'm new to ubuntu and have no idea how to fix this, help please.