Hi I just learn to use the Texpower. I tried to run the pdfscrdemo.tex with pdflatex. Unfortunately I got error: ) ! Undefined control sequence. \@seccntformat ...color {section\thesection@level }{\expandafter \upshape \c... l.36 \section{A list environment} ? x No pages of output. Transcript written on pdfscrdemo.log. ------------------- thanks a lot. Please advise me what's the problem and how to fix it. P.S. This is pdfTeX, Version 3.14159-13c (Web2C 7.3 Jhon )