I released AutoDMG 1.5.5 with a few bug fixes:

• Respect TMPDIR when building images on 10.9+.
• Avoid occasional error messages on program exit.
• Fixed handling of packages where size can’t be calculated.

You can download 1.5.5 from the AutoDMG releases page. If you have questions or need help, you can join us in #autodmg on Slack MacAdmins (but please check the documentation and especially the FAQ first).