I only did a little 10 min mix to try the cue file thiny and this is what I got:

FILE "Mixas.mp3" MP3
TRACK 01 AUDIO
INDEX 01 00.00.00
TRACK 02 AUDIO
INDEX 02 02.23.00
TRACK 03 AUDIO
INDEX 03 04.26.00
TRACK 04 AUDIO
INDEX 04 07.10.00
TRACK 05 AUDIO
INDEX 05 09.13.00

I also did it this way, as I thought the time formats were wrong:

FILE "Mixas1.mp3" MP3
TRACK 01 AUDIO
INDEX 01 00.00.00
TRACK 02 AUDIO
INDEX 02 00.02.23
TRACK 03 AUDIO
INDEX 03 00.04.26
TRACK 04 AUDIO
INDEX 04 00.07.10
TRACK 05 AUDIO
INDEX 05 00.09.13

Both giving me the same error as mentioned.