[MacBook] Boothcamp Unable

I'm trying to create a new partition using bootcamp but it wont let me. I keep on getting an error message that suggests that i

"Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again."

any suggestions ?

p.s. i made a previous partition and deleted through BootCamp Assistant

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