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I think the problem is in the 'WileyNJD-v2.cls'. I hope someone can find out it and tell me how to solve it.

if that's true, s.th. like
\documentclass{WileyNJD-v2}
\begin{document}
X
\end{document}
should throw the same error (it doesn't for me).
If it does (throw the same error), you may ...

I download the template from https://onlinelibrary.wiley.com/page/journal/10991476/homepage/latex_class_files.htm. But I can not use it at all! It always have an error that 'No room for a new \count'. I added '\usepackage{etex}' according to some answers on the net but it did not work.

I think the ...