failed build: Added second exercise

Some of the outputs main.zip, SCORM.main.zip have failed to build. Consult the AUX file for more information.

Commit message: Added second exercise

Full output messages

 Targets: main.zip SCORM.main.zip 
 pdflatex: main.tex → main.pdf 
texfot --no-stderr latexmk  -synctex=5  -g -norc -interaction=nonstopmode -halt-on-error -recorder -deps -deps-out="auxdir/deps/main.pdfdeps" -MP -output-directory="auxdir/pdf" -pdf -dvi- -ps- "main.tex"
/usr/local/bin/texfot: invoking: latexmk -synctex=5 -g -norc -interaction=nonstopmode -halt-on-error -recorder -deps -deps-out=auxdir/deps/main.pdfdeps -MP -output-directory=auxdir/pdf -pdf -dvi- -ps- main.tex
This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2021) (preloaded format=pdflatex)
! Undefined control sequence.
 \coursedescription 
l.39 \hypersetup{pdfsubject={\coursedescription}}
!  ==> Fatal error occurred, no output PDF file produced!
Transcript written on auxdir/pdf/main.log.
Latexmk: Errors, so I did not complete making targets
make: *** [bookml/bookml.mk:340: auxdir/pdf/main.pdf] Error 12
make: Target 'all' not remade because of errors.