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所以我一直试图导出我的jupyter笔记本电脑的一个项目，我一直得到一个错误消息。

If you have not installed xelatex (TeX) you will need to do so before you can export to PDF, for further instructions please look https://nbconvert.readthedocs.io/en/latest/install.html#installing-tex. 
To avoid installing xelatex (TeX) you might want to try exporting to HTML and using your browsers "Print to PDF" feature.

我已经安装了tex，但它不能转换。我甚至不能导出为HTML。