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  [09:25:11.631] Benchmark with 60 resampling iterations 
INFO  [09:25:11.879] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [09:25:11.957] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [09:25:11.979] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [09:25:12.005] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [09:25:12.037] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [09:25:12.071] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [09:25:12.106] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [09:25:12.139] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [09:25:12.180] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [09:25:12.214] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [09:25:12.247] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [09:25:12.813] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [09:25:13.445] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [09:25:13.591] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [09:25:13.732] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [09:25:14.310] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [09:25:14.801] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [09:25:15.323] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [09:25:15.933] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [09:25:16.585] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [09:25:17.084] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [09:25:17.107] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [09:25:17.133] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [09:25:17.154] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [09:25:17.176] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [09:25:17.206] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [09:25:17.227] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [09:25:17.247] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [09:25:17.266] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [09:25:17.285] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [09:25:17.305] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [09:25:17.348] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [09:25:17.421] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [09:25:17.479] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [09:25:17.514] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [09:25:17.549] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [09:25:17.625] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [09:25:17.659] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [09:25:17.696] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [09:25:17.731] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [09:25:17.765] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [09:25:17.784] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [09:25:17.808] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [09:25:17.826] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [09:25:17.845] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [09:25:17.864] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [09:25:17.883] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [09:25:17.902] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [09:25:17.921] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [09:25:17.941] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [09:25:17.966] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [09:25:18.023] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [09:25:18.079] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [09:25:18.142] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [09:25:18.200] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [09:25:18.262] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [09:25:18.317] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [09:25:18.373] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [09:25:18.435] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [09:25:18.491] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [09:25:18.553] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted