This is XeTeX, Version 3.14159265-2.6-0.999991 (TeX Live 2019/W32TeX) (preloaded format=xelatex 2019.12.14)  6 MAR 2020 17:56
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**bookdown.tex
(./bookdown.tex
LaTeX2e <2019-10-01> patch level 3

! LaTeX Error: File `ctexbook.cls' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: cls)

Enter file name: 
! Emergency stop.
<read *> 
         
l.2 \usepackage
               {lmodern}^^M 
Here is how much of TeX's memory you used:
 10 strings out of 494458
 119 string characters out of 6171841
 58050 words of memory out of 5000000
 4470 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 14 hyphenation exceptions out of 8191
 14i,0n,8p,53b,10s stack positions out of 5000i,500n,10000p,200000b,80000s

No pages of output.


! kpathsea: Running mktexfmt xelatex.fmt

! The command name is C:\Users\Shixiang\AppData\Roaming\TinyTeX\bin\win32\mktexfmt