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B.6 Can only be used in preamble.

Some commands, such as \usepackage may only appear in the preamble . Check to see where you have put it. For example, this error will be caused by doing:

\documentclass{scrartcl} \begin{document}✘ \usepackage{graphicx}

instead of

\documentclass{scrartcl} \usepackage{graphicx}✔ \begin{document}

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This book is also available as A4 PDF or 12.8cm x 9.6cm PDF or paperback (ISBN 978-1-909440-00-5).