If you do not specify the -balanced parameter, the new drive must be an exact match for the array member goals when you exchange a new drive for an existing array member. The new drive that you have specified does not match the goals. If you want to use the drive that you specified to replace an existing member of the array that you specified, you must specify the -balanced parameter, which forces the array member goals to be changed to accommodate the new drive.
Either select a different drive that matches the array member goals or specify the -balanced parameter to force a change in the array member goals to accommodate the new drive, and resubmit the command.