hexo: template render error: parseAggregate: expected colon after dict key

When I run hexo g, some errors happened, there are as follows.

template render error: parseAggregate: expected colon after dict key
at Error.exports.TemplateError (e:\blog\Hexo\node_modules\hexo\node_modules\nunjucks\src\lib.js:51:19
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In my context, a equation using latex was written, here are shown for you.

be shown as equation(3): \begin{equation} G(x,y) = Ae^{- \left( \frac{{\left(x-{\mu}{x} \right)}^{2}}{2{{\sigma}{x}}^{2}} + \frac{{\left(y-{\mu}{y} \right)}^{2}}{2{{\sigma}{y}}^{2}} \right)} \tag{3} \end{equation}

If I deleted this ,no error happened.

But If

如公式(2)所示: \begin{equation} G(x) = Ae^{-x^2/2\sigma^2} \tag{2} \end{equation}

was written in context, no error happened too.

And the case needed to be said is that I add

<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=default"></script>

in my context. Does it make something wrong ? I cannot handle this problem, Help~ Thanks in advance~

More information is shown in image.