Could you provide a minimal TeX input file?
I need to discuss with Songwrite author to know how to get such file. I'll tell you more as soon as I've contacted him.
This is not an error, but a warning, telling you that some fonts were replaced by others due to non-availability. If songwrite fails here it is somewhat broken.
Indeed I remember that the program was just stopping on the reported message, not crashing. Then pressing Ctrl+C made it go on and produce the PDF document. However there were font inconsistencies in it, I can't remember which ones unfortunately.
Hmm, I wouldn't mix the cmr and the aer font. Further I'm not 100% sure if ae is really still needed in times of latin modern and cm super. Ralf, are you still on the list? Can you help here?
I must say I really don't know what these fonts are and how Texlive handles them. Any better way to deal with this issue will be appreciated :).
Cheers, JM.