the cleveref usepackage: \cref

Question

When I run the following code (pdflatex), Command Line:

pdflatex.exe --interaction=errorstopmode --synctex=1 "ex_article.tex"

Startup Folder: C:\Users\wendy\Desktop\siamart_171218

This is pdfTeX, Version 3.1415926-2.3-1.40.12 (MiKTeX 2.9)
entering extended mode
(C:\Users\wendy\Desktop\siamart_171218\ex_article.tex
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for loaded.

For additional information on amsmath, use the `?' option.

Package caption Warning: Unsupported document class (or package) detected,
(caption)                usage of the caption package is not recommended.
See the caption package documentation for explanation.

Package xr Warning: 
No file ex_supplement.aux
LABELS NOT IMPORTED.
 on input line 35.

No file ex_article.aux.
Package amsmath Warning: Cannot use `split' here;
(amsmath)                trying to recover with `aligned' on input line 116.
LaTeX Warning: Reference `sec:Pre' on page 1 undefined on input line 122.
LaTeX Warning: Reference `sec:Alt' on page 1 undefined on input line 122.
LaTeX Warning: Reference `sec:Con' on page 1 undefined on input line 122.
Package amsmath Warning: Cannot use `split' here;
(amsmath)                trying to recover with `aligned' on input line 155.

[3]

LaTeX Warning: Reference `eq:1' on page 1 undefined on input line 230.

Package amsmath Warning: Cannot use `split' here;
(amsmath)                trying to recover with `aligned' on input line 1321.

No file ex_article.bbl.
[13] (C:\Users\wendy\Desktop\siamart_171218\ex_article.aux)

gbk2uni, version 0.22, initially implemented by cxterm and ZLB in Jan. 2003
  enhanced by hooklee in Mar. 2003.
  please visit www.ctex.org and www.chinatex.org for more information.
gbk2uni ex_article.out is finished!


_____________________________________________________________________

 PDFLaTeX Compilation Report (Pages: 13)

 Errors: 0   Warnings: 20   Bad Boxes: 5
_____________________________________________________________________

That's all.

What I get is:

We present some preliminaries in ??.

Even I can get the PDF . I guess if the cleveref.sty is too old to support the command \cref ? But I can't find the new cleveref.sty in the official website. And does it have the relationship with a fact that I delete the ex_article.aux every time. If not, I will get the following message and can't get the pdf.

Don't delete the .aux:

...thod of multipliers\relax}{equation.9}{}}

The original code is:

\documentclass[review,onefignum,onetabnum]{siamart171218}
\usepackage{mathrsfs}
\usepackage{subfig}
\input{ex_shared}
\ifpdf
\hypersetup{
  pdftitle={matrix information},
  pdfauthor={Wen}
}
\fi
\externaldocument{ex_supplement}

\begin{document}
\section{Introduction}

\label{sec:Int}
The paper is organized as follows. We present some preliminaries in \cref{sec:Int}. 

\end{document}