Error when running lidar segmentation

[nealresearch]

I am trying to segment the lidar data. But i keep getting errors "Error in as.list.default(X) :
no method for coercing this S4 class to a vector". Also what is the output suppose to be. Is it an path or?

Here is the code that i tried with

library("lidR")
library(whitebox)

las <-readLAS("M:\build.las")

output <- "M:\lidar\las\output.las"

segment <- wbt_lidar_segmentation(
las,
output,
radius = 2,
num_iter = 50,
num_samples = 10,
threshold = 0.15,
model_size = 15,
max_slope = 80,
norm_diff = 10,
maxzdiff = 1,
classes = FALSE,
ground = FALSE,
wd = NULL,
verbose_mode = FALSE,
compress_rasters = FALSE,
command_only = FALSE
)

[brownag]

{whitebox} does not currently support using S4 classes as input. In this case you are trying to use a class that represents a LAS file from the {lidR} package, instead try passing the path to the .las file as your input, e.g.

las <- "M:\build.las"

EDIT: As with input, output should also be a path to a LiDAR file (.las)