I'm trying to create correlation plot in R and I keep getting the error message: Can't combine 'Age' <double> and 'Attrition' <character>. How can I solve this issue?

\> corrplot(empAttr,method = 'number')

Error: Can't combine \`Age\` <double> and \`Attrition\` <character>.

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I also tried coercing the variable attrition into a numeric variable and got this:

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attrition <- as.numeric(empAttrcopy$Attrition)

Warning message:

NAs introduced by coercion

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correlation datascience lt plot