I've run into this issue before, when using the siggraph latex template. I get an error:
! Undefined control sequence.
<argument> \citename
It's tricky to track down. It seems the problem is that the siggraph style is defining cite but then it's getting wiped out but an included package. In my case I need to remove an unneeded:
\usepackage{cite}
Then the problem went away.