dfu-programmer memory readerror 100

dfu-programmer atmega32u2 read --debug 100
     target: atmega32u2
    chip_id: 0x2ff0
  vendor_id: 0x03eb
    command: read
      quiet: false
      debug: 100
device_type: AVR
------ command specific below ------

atmel.c:756: atmel_read_flash( 0x7ffc994c1ec0, 0x7ffc994c1df0, 0, false )
atmel.c:1041: atmel_select_memory_unit( 0x7ffc994c1ec0, 0 )
atmel.c:1055: Ignore Select Memory Unit for non GRP_AVR32 device.
Reading 0x7000 bytes...
atmel.c:1100: atmel_select_page( 0x7ffc994c1ec0, 0 )
atmel.c:1114: Selecting page 0, address 0x0.
atmel.c:717: dfu_download failed
atmel.c:828: Error reading block 0x0 to 0x3FF: err -1.
ERROR
Memory read error, use debug for more info.
commands.c:619: ERROR: could not read memory, err -5.