Question about error of "non-numeric argument to binary operator"

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Hi,

I'm going to run my thesis that use R language for Lee-Carter method but
some error occur when I'm running this code.

Please guide me Sir.

male.lca<-lca(malaysia.male)
Error in pop * mx : non-numeric argument to binary operator
You have provided very little information. Missing are any description of the dataset and no information about where you are getting the lca function. Why should we be guessing about these bits?
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