Problem with PCA code

Why i am getting an error - that x must be numeric, when my df3 has no non-numeric data. Attached image.

My code is -
df3 <- tibble::add_column(df2, Liking = c("3.85", "5.13", "6.00", "5.73",
"4.91", "5.01", "5.77", "5.35",
"4.39", "5.57", "4.99", "5.94"),
.after = "Cauliflower")
quanti.sup <- df3[1:12, 22, drop = FALSE]
head(quanti.sup)
quanti.coord <- cor(quanti.sup, res.pca$x)
quanti.cos2 <- quanti.coord^2

Liking is non numeric. You are using double quotes sonyou are making chars

var_a <- 123
var_b <- "123"

class(var_a)
class(var_b)
df3 <- tibble::add_column(df2, Liking = c(3.85, 5.13, 6.00, 5.73,
                                          4.91, 5.01, 5.77, 5.35,
                                          4.39, 5.57, 4.99, 5.94),
                               .after = "Cauliflower")
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@nirgrahamuk, What do you mean, double quotes makes it non-numeric? So how I should make it numeric?