This is TeX, Version 3.14159 (Web2C 7.3.1) (format=tex 2000.7.19) 25 JAN 2002 19:33 **\nonstopmode\input introduction.tex (introduction.tex ! Undefined control sequence. l.1 \chapter *{Introduction} The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. ) ! Emergency stop. <*> \nonstopmode\input introduction.tex *** (job aborted, no legal \end found) No pages of output.