How do I use the titlesec package if I am under \documentclass[conference]{IEEEtran} ?
I got the following error:
!Undefined control sequence.
<argument> \subparagraph
The titlesec package assumes all of the section levels provided by the standard classes are present. This includes the subparagraph level. The IEEEtrans class doesn't define a level subparagraph so titlesec doesn't know what to do when it tries to redefine it. The simple solution is to simply add the line
\newcommand{\subparagraph}{}
to your preamble before loading the titlesec package. If you need to actually have it work, you will then need to provide its definition via the regular titlesec methods.
sig-alternate.clsfrom ACM. This solves my pain. – Jinghao Shi Sep 29 '14 at 17:13