cannot create labels to subfigures

[st-le]

hi Hadziq,

Thank you and the original author to provide such a convenient template for the NTUST thesis. It lifts a huge burden from the drafting.

I am currently using this template with Overleaf with little issue. However, I cannot have labels for the subfigures and refer to them. An example follows

\begin{figure}[h]
\centering
    % \subfigure[]
    \begin{subfigure}[b]{0.5\textwidth}
        \centering
        \includegraphics[width=\textwidth]{English Version/figures/7a.png}
        \label{fig:rbcep_org}  % <-- here error
    \end{subfigure}
    % \subfigure[]
    \begin{subfigure}[b]{0.35\textwidth}
        \centering
        \includegraphics[width=\textwidth]{English Version/figures/7b.png}
        \label{fig:rbcep_crp}  % <-- here error
    \end{subfigure}
% \vspace{-5pt}
\caption{some caption}
\label{fig:train_img}
\end{figure}

the error message:

Package caption Warning: \label without proper reference on input line ...

and when it is referred to with \ref{fig:rbcep_crp}, it returns [??] and with error message

I've found that this only happens with ntust_report document class. When using overleaf's article document class, it works fine.

Could you give some suggestions or support? Thank you again.

[st-le]

add at least an empty caption i.e. \caption{} before the \label command fixed it. Lots of trials failed but this time it worked.