Is it possible to combine probsoln with skills package?

I am trying to include three packages togetther and is not possible but i do not know how to make.

Probsoln, exam class, and skills.

But they does not work fine.

For me skills is very useful and necessary.

something like that gives me errors,

documentclass[addpoints]{exam}

usepackage{probsoln}


usepackage{skills}

skilldef{writing}{L1.1}{Writing to argue and write to communicate
and share ideas}
skilldef{vocabulary}{H3.2}{Learning specific vocabulary and using it in context}
skilldef{situationInTime}{C1.1}{Situating in time and elaborating
chronological landmarks}

begin{document}

begin{questions}

question[1] What is the main drawback of ray guns? 

question[1] Which of the following is an ingredient of
mind-controlling cookies?

end{questions}

end{document}

I need something helps me

Thanks