LaTeX doesn't recognise the environment you have specified.
- Check you have spelt the environment name correctly.
You will get this error if you do, say,
- If it's your own environment, check you have defined the
environment before using it.
- If the environment is defined in a package, check you
have included the package using the
This book is also available as A4 PDF or 12.8cm x 9.6cm PDF or paperback (ISBN 978-1-909440-00-5).