Cannot add free space into macOS partition because "the disk for one of the specified operations could not be found" How can I merge free space into the active partition "Macintosh HD"?

ADMINs-Mac:~ admin$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *107.4 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            42.6 GB    disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3




I have tried the following:






  An internal error has occurred and he disk for one of the specified operations could not be found. This may be a temporary issue, try again.
Michael's command may solve the question of how to delete free partion.

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