Cannot add file(Use UDF mode)

I am using BurnAware Free. I was trying to burn MP3s, and I also
made an Audio CD from WAVS.
Got an error message:
Cannot add file(Use UDF mode).

Probably because file names were too large. I either shortened, or saved folder as ZIP.

Burner Options are:
UDF
UDF / ISO (DVD-Video mode)
ISO

File System:
ISO 9660
ISO 9660 + Joliet

Data mode:
Mode1
Mode2/XA

ISO Level:
Level 1(Max 11 Chars)
Level 2(Max 31 Chars)

Which one(s) should I set to burn long file names?
I also want the files readable in older CD-ROMs.