ERROR infomation : argument "task" is missing, with no default

[wyfwps]

Run the codes as below, the error came as "Error in assert_class(task, "Task", .var.name = .var.name) : argument "task" is missing, with no default"

---

library(tidyverse)
library(mlr3verse)
boston = tsk("boston_housing")
str(boston$data())

prep = po("encode", method = "treatment",
affect_columns = selector_name("chas")) %>>%
po("encodeimpact",
affect_columns = selector_name("town"))
boston = prep$train(boston)[[1]]
set.seed(123)
split = partition(boston, ratio = 0.8)
learner = lrn("regr.glmnet", alpha = 0) # 需要 glmnet 包
search_space = ps(
s = p_dbl(lower = 0.001, upper = 2))
at = auto_tuner(
tuner = tnr("random_search"),
learner = learner,
resampling = rsmp("cv", folds = 3L), # 3 折交叉验证
measure = msr("regr.rmse"), # 评估指标选 rmse
search_space = search_space,
term_evals = 10) # 计算 10 次终止

set.seed(123)
at$train(boston, row_ids = split$train)
learner$param_set$values =
at$tuning_result$learner_param_vals[[1]]
learner$train(boston, row_ids = split$train)
autoplot(learner,taks=boston)

[bblodfon]

Hi @wyfwps! Can you please copy your code, run reprex::reprex(), and then copy-paste the result in the above post? Would be helpful to add the library versions as well with devtools::session_info(). The last line has a taks instead of task, maybe that's the problem?