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

> ### 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  [17:31:07.480] Benchmark with 60 resampling iterations 
INFO  [17:31:07.663] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:31:07.766] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:31:07.787] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:31:07.810] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:31:07.830] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:31:07.850] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:31:07.870] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:31:07.892] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:31:07.912] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:31:07.939] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:31:07.962] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:31:08.221] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:31:08.400] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:31:08.586] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:31:08.793] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:31:09.048] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:31:09.241] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:31:09.426] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:31:09.649] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:31:09.817] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:31:10.094] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:31:10.113] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:31:10.179] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:31:10.239] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:31:10.293] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:31:10.319] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:31:10.346] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:31:10.368] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:31:10.396] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:31:10.418] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:31:10.439] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:31:10.475] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:31:10.514] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:31:10.597] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:31:10.693] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:31:10.777] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:31:10.858] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:31:10.935] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:31:11.124] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:31:11.208] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:31:11.292] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:31:11.320] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:31:11.341] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:31:11.363] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:31:11.394] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:31:11.460] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:31:11.504] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:31:11.550] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:31:11.591] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:31:11.639] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:31:11.683] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:31:11.888] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:31:12.013] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:31:12.139] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:31:12.235] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:31:12.321] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:31:12.434] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:31:12.519] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:31:12.673] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:31:12.783] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:31:12.882] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted