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\begin{equation}\label{*}
\frac{d}{dz}(\frac{z}{1^2}+\frac{z^2}{2^2}+\frac{z^3}{3^2}+\cdots) = -\frac{ln(1-z)}{z}
\end{equation}

I found the mistake - I had left a label unfilled as above. Interesting that this was line 45 and the problem showed up in line 59. Thank you for your advice, php1ic ...

I get the following error message:

! Missing \endcsname inserted.
<to be read again>
\csname\endcsname
1.59 \end{equation}

Line 59 is the last line of the following:

\begin{equation}\label{3e}
(-ln(1-s)ln(s))_0^{1-z} + \int_1^{1-z}\frac{ln(1-s)}{s}\,ds (using Integration by Parts)
\end{equation ...

Many thanks, meho_r and stefan_k, you have solved my problem instantly. Thank you also for your welcome to the forum; I will try to work things out for myself, but it is great to know that help is at hand!

All the best,

Max

I have what is probably a simple problem - I have used the code below to import a graphic:

\begin{center}
\begin{figure}
% Requires \usepackage{graphicx}
\includegraphics[width=100mm]{code-1.png}\\
\caption{Periodic recurrence relation search code}\label{B}
\end{figure}
\end{center}

I have put ...