trouble writing normal CD’S on my iMac using Toast 9

[Dazign]

Hi, I’m having trouble writing normal CD’S on my iMac using Toast 9

This is the error massage.

The drive reported an error:
Sense Key = ILLEGAL REQUEST
Sense Code = 0x72, 0x03
SESSION FIXATION ERROR – INCOMPLETE TRACK IN SESSION

Lead-in or Lead-out failed to be written.

Please help.

Thanks Darren