How to resolve error:non numeric argument to binary operator while applying LDA using caret

@pagal_guy wrote:

Hello,

I am using the below code to run lda from the caret package in R:

ldaModel <- train(df_train[,-16], df_train[,16], 
                  method='lda', 
                  trControl=Control,  
                  metric = "Accuracy",
                  preProc = c("center", "scale"))

However I am getting an error:

Pasted image753x165 26.3 KB

What does this error mean and how to remove it?r

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