I don't see an error message?
If you mean the "partition 1 does not start on physical sector boundary" message, that appears because of this:
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
This is an "advanced format" disk with 4096 byte physical sectors, but for compatibility reasons it emulates 512 byte sectors. Each physical sector contains 8 emulated, logical sectors.
Your partition starts at emulated sector 243201, which is not a multiple of 8. This is not optimal, and that's why you're getting the "does not start on physical sector boundary" message.