Running examples in ‘mlr3-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: BenchmarkResult
> ### Title: Container for Benchmarking Results
> ### Aliases: BenchmarkResult
> 
> ### ** Examples
> 
> set.seed(123)
> learners = list(
+   lrn("classif.featureless", predict_type = "prob"),
+   lrn("classif.rpart", predict_type = "prob")
+ )
> 
> design = benchmark_grid(
+   tasks = list(tsk("sonar"), tsk("penguins")),
+   learners = learners,
+   resamplings = rsmp("cv", folds = 3)
+ )
> print(design)
       task             learner resampling
     <char>              <char>     <char>
1:    sonar classif.featureless         cv
2:    sonar       classif.rpart         cv
3: penguins classif.featureless         cv
4: penguins       classif.rpart         cv
> 
> bmr = benchmark(design)
INFO  [17:18:41.943] [mlr3] Running benchmark with 12 resampling iterations
INFO  [17:18:42.067] [mlr3] Applying learner 'classif.featureless' on task 'sonar' (iter 1/3)
INFO  [17:18:42.123] [mlr3] Applying learner 'classif.featureless' on task 'sonar' (iter 2/3)
INFO  [17:18:42.159] [mlr3] Applying learner 'classif.featureless' on task 'sonar' (iter 3/3)
INFO  [17:18:42.192] [mlr3] Applying learner 'classif.rpart' on task 'sonar' (iter 1/3)
INFO  [17:18:42.239] [mlr3] Applying learner 'classif.rpart' on task 'sonar' (iter 2/3)
INFO  [17:18:42.278] [mlr3] Applying learner 'classif.rpart' on task 'sonar' (iter 3/3)
INFO  [17:18:42.320] [mlr3] Applying learner 'classif.featureless' on task 'penguins' (iter 1/3)
INFO  [17:18:42.400] [mlr3] Applying learner 'classif.featureless' on task 'penguins' (iter 2/3)
INFO  [17:18:42.484] [mlr3] Applying learner 'classif.featureless' on task 'penguins' (iter 3/3)
INFO  [17:18:42.560] [mlr3] Applying learner 'classif.rpart' on task 'penguins' (iter 1/3)
INFO  [17:18:42.586] [mlr3] Applying learner 'classif.rpart' on task 'penguins' (iter 2/3)
INFO  [17:18:42.612] [mlr3] Applying learner 'classif.rpart' on task 'penguins' (iter 3/3)
INFO  [17:18:42.645] [mlr3] Finished benchmark
Error in `[.data.table`(data, , `:=`("task_hash", task[[1L]]$hash), by = "uhash") : 
  attempt access index 9/9 in VECTOR_ELT
Calls: benchmark ... initialize -> .__ResultData__initialize -> [ -> [.data.table
Execution halted