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  [02:05:02.932] Benchmark with 60 resampling iterations 
INFO  [02:05:03.228] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [02:05:03.295] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [02:05:03.319] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [02:05:03.355] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [02:05:03.427] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [02:05:03.471] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [02:05:03.515] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [02:05:03.553] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [02:05:03.623] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [02:05:03.683] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [02:05:03.716] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [02:05:03.894] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [02:05:04.105] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [02:05:04.257] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [02:05:04.394] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [02:05:04.547] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [02:05:04.676] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [02:05:04.808] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [02:05:04.944] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [02:05:05.074] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [02:05:05.232] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [02:05:05.251] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [02:05:05.272] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [02:05:05.292] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [02:05:05.311] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [02:05:05.331] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [02:05:05.351] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [02:05:05.370] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [02:05:05.395] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [02:05:05.416] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [02:05:05.437] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [02:05:05.473] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [02:05:05.507] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [02:05:05.558] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [02:05:05.612] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [02:05:05.645] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [02:05:05.678] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [02:05:05.710] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [02:05:05.833] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [02:05:05.868] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [02:05:05.902] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [02:05:05.922] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [02:05:05.942] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [02:05:05.961] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [02:05:05.980] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [02:05:06.004] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [02:05:06.022] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [02:05:06.040] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [02:05:06.060] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [02:05:06.079] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [02:05:06.098] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [02:05:06.158] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [02:05:06.231] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [02:05:06.291] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [02:05:06.357] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [02:05:06.410] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [02:05:06.471] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [02:05:06.524] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [02:05:06.580] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [02:05:06.642] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [02:05:06.715] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted