Cross-reference problem relevant to figures only

@XU_Yihao Let's try something else. What is the output of the command,

sessionInfo()

When you post the results, please paste them here inside of a verbatim block, e.g.

```
<-- PASTE IN HERE -->
```

That will keep the formatting of the output and make it easier to read. You can either type the three backticks above and below the output yourself, click the editor button above which looks like </>, or use the shortcut Ctrl+Shift+C. Doing this whenever you are posting code or code output will help you get, on the whole, better quality help.

Not relevant to issues with R Markdown, but if and when you have issues with R code, you should strongly consider making a reprex.

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