math notation in the `\section` part doesn't work

Question

I'm getting error while I'm using this command in XeTeX:

\section{Henk Barendregt book on $\lambda$-calculus}

How can I fix it ?

Command Line:   bibtex.exe "lane2"
Startup Folder: C:\Users\hynek0\Desktop\TH0dipl\Y
This is BibTeX, Version 0.99d (TeX Live 2021/W32TeX)
The top-level auxiliary file: lane2.aux
I found no \citation commands---while reading file lane2.aux
I found no \bibdata command---while reading file lane2.aux
I found no \bibstyle command---while reading file lane2.aux
(There were 3 error messages)
Command Line:   makeindex.exe "lane2.idx"
Startup Folder: C:\Users\hynek0\Desktop\TH0dipl\Y
This is makeindex, version 2.15 [TeX Live 2021/W32TeX] (kpathsea + Thai support).
Scanning input file lane2.idx...done (0 entries accepted, 0 rejected).
Nothing written in lane2.ind.
Transcript written in lane2.ilg.
Command Line:   makeindex.exe -s "lane2.ist" -t "lane2.glg" -o "lane2.gls" "lane2.glo"
Startup Folder: C:\Users\hynek0\Desktop\TH0dipl\Y
Index style file lane2.ist not found.
Usage: makeindex [-ilqrcg] [-s sty] [-o ind] [-t log] [-p num] [idx0 idx1 ...]
Command Line:   latexmk -xelatex --interaction=errorstopmode --synctex=-1 "lane2.tex"
Startup Folder: C:\Users\hynek0\Desktop\TH0dipl\Y
Rc files read:
  NONE
Latexmk: This is Latexmk, John Collins, 20 November 2021, version: 4.76.
Rule 'xelatex': File changes, etc:
   Changed files, or newly in use since previous run(s):
      'lane2.tex'

Run number 1 of rule 'xelatex'

Running 'xelatex -no-pdf --interaction=errorstopmode --synctex=-1 -recorder  "lane2.tex"'
Latexmk: applying rule 'xelatex'...
This is XeTeX, Version 3.141592653-2.6-0.999993 (TeX Live 2021/W32TeX) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
(./lane2.tex
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[]\TU/LibertinusSerif(0)/m/n/10 There were some other people present and one of
 them
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! Improper alphabetic constant.
<to be read again> 
                   \mitlambda 
l.131 I
        didn't care to rewrite Henk's email in \LaTeX\ notation.
?