6027-2736 The value for --block-size must be the keyword auto or the value must be of the form `n`K, `n`M, `n`G or `n`T, where n is an optional integer in the range 1 to 1023.

Explanation
An invalid value was specified with the --block-size option.
User response
Reissue the command with a valid option. 

6027-2736 The value for --block-size must be the keyword auto or the value must be of the form nK, nM, nG or nT, where n is an optional integer in the range 1 to 1023.