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        \caption{Experiment 1 reactions and mechanism}

When I don't use scale, this MWE works fine. However, when I use scale, I get the errors:

Runaway argument?
scale=0.8]{schemes/lab1} \caption {Experiment 1 reactions and mechanism} \end {scheme} 
/Users/Zak/Documents/McGill/CHEM 222/TSWLatexianTemp_001549.tex:16: Paragraph ended before \Gin@iii was complete.


\begin{document} ended by \end{scheme}.

What am I missing?

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Try including \usepackage{graphicx} in the preamble. – Yiannis Lazarides Jan 31 '12 at 17:02
Perfect, thanks. – Zak Jan 31 '12 at 17:04
@YiannisLazarides: Please convert your comment into an answer. – Werner Jan 31 '12 at 17:17
@Zak: Rather than marking the question as "SOLVED" in the title, I've requested Yiannis to convert his comment into an answer. Once this is done, consider upvoting and marking it as accepted - How do you accept an answer? – Werner Jan 31 '12 at 17:18
up vote 4 down vote accepted

Try including \usepackage{graphicx} in the preamble.

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