Exsol package didn't work with me

Question

Exsol package didn't work with me in this code:
documentclass{book}

usepackage{exsol}

begin{document}

begin{exercises}[columns=2]
        begin{exercise}
            Calculate $y = 5 + 7$
        end{exercises}
        begin{solution}
            $y = 12$
        end{solution}
        begin{exercise}
            Calculate $y = 7 - 12$
        end{exercises}
        begin{solution}
            $y = -5$
        end{solution}
    end{exercises}

end{document}

Marijn · Accepted Answer

The exsol package requires Babel (although the manual says it is optional). You can use any language that you want, for example english.
Furthermore, in your code, you close a single exercise with end{exercises}, which should not have the s at the end (only the full block should end with end{exercises}).
Working example:
documentclass{book}
usepackage[english]{babel}
usepackage{exsol}

begin{document}

begin{exercises}[columns=2]
        begin{exercise}
            Calculate $y = 5 + 7$
        end{exercise}
        begin{solution}
            $y = 12$
        end{solution}
        begin{exercise}
            Calculate $y = 7 - 12$
        end{exercise}
        begin{solution}
            $y = -5$
        end{solution}
    end{exercises}

end{document}

Result:

Exsol package didn't work with me

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