I was playing around with dce and bake on linux mint trying to get elf-loader to build, without success so far, and I ended up getting the following:

brian@LinuxMintVirt ~/Documents/Code/ns3/bake $ ./bake.py build
  >Unexpected exception, please contact the bake developers!<

I can't replicate what I did but it is most certainly my fault.  Perhaps instead of directing people to contact 'the bake developers' it could point them to Bugzilla, the users list, or some other documentation.