The 'list' object cannot be coerced to type 'double' in R shiny

While observing your error, I think the message might have something to do with the statement unlist(as.numeric(y)):

You can simply try the following code, but this will also throw an error message:

    as.numeric(list(c("1", "2"), "3")) # error: 'list' object cannot be coerced to type 'double'

But if you run:

    as.numeric(list("1", "2"))

This will work.

In last what you can do is save it by switching the commands. First, try to unlist, then type-cast second:

    as.numeric(unlist(list(c("1", "2"), "3"))) # works: c(1, 2, 3)

Note: This error frequently shows up when you've got a list of numeric strings which you want R to treat as numbers.