external harddrive mount issues

I have an usb external hard drive with all my media files on it. To keep my programs seeing all my files I set a mount point. Unfortunetly I messed up the point now I can not mount my disk it gives me this error:

mount_point cannot contain the following characters: newline, G_DIR_SEPARATOR (usually/)

is there any way I can fix this so I can mount my drive again?

Did you set the mount point in /etc/fstab?

cat /etc/fstab
sudo fdisk -l

no I set it in the properties menu in nautilus.