Topic: How do I resolve "unable to transcode font" error?
I am not sure if this is a Flex Builder 3 issue per se, but I keep running into this error randomly with some fonts and not another, even though I am just embedding a straight TTF font.
exception during transcoding: Unexpected exception encountered while reading font file 'assets/Helvetica.ttf' unable to build font 'Helvetica' Unable to transcode assets/Helvetica.ttf
A bug has been filed to Adobe and fortunately there is a quick solution to get around it. All you have to do is go to your project properties (right-click on your project would be easiest), then go to "Flex Compiler", then under "Additional compiler arguments:" add "-managers flash.fonts.AFEFontManager".
There will most likely be something else already in that box, all you have to do is add a space between each arguments.
Remember, you can only embed TTF and OTF fonts in Flex 3 (or use SWF for any other type). This workaround won't work if your font is not supported anyway.