Problems Booting Kali Linux USB

I have been trying for a couple days now to get Kali Linux onto my USB drive so I can boot from it on other machines. I was recently able to do it, but I cant across a couple errors when testing it out. I restarted my computer, held Option (Alt) and selected the drive I wanted to boot from, all normal from here. Then when I tried to finish up the process it says that there were 2 errors:

"attempt read or write outside of disk 'loop'" "load keel first" Then it took me to a blue page with other boot options. I tried both of them, but with no improved results. I have no idea how to fix these issues, please help!

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