Trying to clone but CCC says "mach_kernel missing"

i am trying to clone my 1 TB boot OS drive in bay 1 to a 4 TB drive in another bay so that i can put this 4 TB drive in bay 1 and use it as my boot drive. i would like to do this in order to have a ton of expansion on my new-used 2012 mac pro.
however CCC is giving m this error.
does anyone know how to solve this while i try and research the CCC faq and other documents?
THANKS

looks like an answer may be here:
(mach_kernel) does not exist. What to do to create a bootable backup?

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