Running examples in ‘mlr3viz-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: autoplot.BenchmarkResult
> ### Title: Plot for BenchmarkResult
> ### Aliases: autoplot.BenchmarkResult
> 
> ### ** Examples
> 
> library(mlr3)
> library(mlr3viz)
> 
> tasks = tsks(c("spam", "pima", "sonar"))
> learner = lrns(c("classif.featureless", "classif.rpart"),
+   predict_type = "prob")
> resampling = rsmps("cv")
> object = benchmark(benchmark_grid(tasks, learner, resampling))
INFO  [22:53:12.807] Benchmark with 60 resampling iterations 
INFO  [22:53:13.014] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:53:13.075] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:53:13.107] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:53:13.169] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:53:13.216] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:53:13.261] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:53:13.310] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:53:13.345] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:53:13.378] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:53:13.430] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:53:13.482] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:53:14.028] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:53:14.415] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:53:14.877] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:53:15.423] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:53:15.912] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:53:16.394] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:53:16.878] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:53:17.460] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:53:17.957] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:53:18.508] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:53:18.525] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:53:18.541] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:53:18.557] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:53:18.573] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:53:18.589] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:53:18.604] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:53:18.636] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:53:18.672] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:53:18.703] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:53:18.734] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:53:18.776] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:53:18.889] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:53:18.930] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:53:18.994] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:53:19.065] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:53:19.124] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:53:19.168] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:53:19.295] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:53:19.353] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:53:19.398] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:53:19.412] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:53:19.429] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:53:19.442] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:53:19.457] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:53:19.475] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:53:19.489] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:53:19.518] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:53:19.548] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:53:19.578] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:53:19.609] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:53:19.714] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:53:19.784] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:53:19.855] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:53:19.915] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:53:19.955] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:53:20.001] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:53:20.069] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:53:20.132] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:53:20.176] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:53:20.216] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted