Problems burning CDs

[AndrewRandle]

Having a problem with Nero and burning a CD. It gets to 100% and says Medium not present. It's on a friends computer so i'm limited to the information I have but he sent me the log and here it is:

1:08:53 PM #24 Text 0 File ThreadedTransfer.cpp, Line 219
all writers idle, stopping conversion

1:17:54 PM #25 MMC -1080 File ThreadedTransferInterface.cpp, Line 1587
Medium not present

1:17:54 PM #26 TRANSFER -18 File ThreadedTransferInterface.cpp, Line 1587
Could not perform EndTrack

1:17:54 PM #27 Text 0 File Mmc.cpp, Line 12699
<ATAPI CD-RW 16/12/40X > start Close Session

1:17:54 PM #28 SCSI -1080 File Cdrdrv.cpp, Line 1208
SCSI Exec, HA 0, TA 0, LUN 0
Status: 0x04 (0x01, SCSI_ERR)
HA-Status 0x00 (0x00, OK)
TA-Status 0x02 (0x01, SCSI_TASTATUS_CHKCOND)
Sense Key: 0x02 (KEY_NOT_READY)
Sense Code: 0x3A
Sense Qual: 0x00
CDB Data: 0x5B 0x01 0x02 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Sense Data: 0x70 0x00 0x02 0x00 0x00 0x00 0x00 0x0A
0x00 0x00 0x00 0x00 0x3A 0x00

1:17:54 PM #29 MMC -1080 File WriterStatus.cpp, Line 233
Medium not present

1:17:54 PM #30 TRANSFER -19 File WriterStatus.cpp, Line 233
Could not perform Fixation

1:17:54 PM #31 Text 0 File WriterStatus.cpp, Line 242
falling back to disc fixation

1:17:54 PM #32 Phase 38 File dlgbrnst.cpp, Line 1655
Burn process failed at 16x (2,400 KB/s)

1:17:54 PM #33 Text 0 File Scsicmd.cpp, Line 406
SCSI not using temporary buffers
20 out of 20 temporary buffers allocated


if that's enough info... Any ideas on what's going on? thanks in advance!