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  [09:30:10.860] Benchmark with 60 resampling iterations 
INFO  [09:30:11.029] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [09:30:11.100] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [09:30:11.144] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [09:30:11.202] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [09:30:11.244] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [09:30:11.287] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [09:30:11.329] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [09:30:11.371] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [09:30:11.419] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [09:30:11.462] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [09:30:11.504] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [09:30:11.951] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [09:30:12.516] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [09:30:13.110] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [09:30:13.674] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [09:30:14.174] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [09:30:14.518] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [09:30:15.060] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [09:30:15.403] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [09:30:15.997] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [09:30:16.270] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [09:30:16.291] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [09:30:16.311] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [09:30:16.330] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [09:30:16.350] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [09:30:16.376] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [09:30:16.394] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [09:30:16.413] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [09:30:16.431] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [09:30:16.450] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [09:30:16.469] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [09:30:16.521] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [09:30:16.578] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [09:30:16.613] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [09:30:16.647] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [09:30:16.680] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [09:30:16.835] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [09:30:16.887] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [09:30:16.924] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [09:30:16.961] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [09:30:16.997] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [09:30:17.016] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [09:30:17.042] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [09:30:17.062] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [09:30:17.081] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [09:30:17.101] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [09:30:17.120] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [09:30:17.140] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [09:30:17.160] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [09:30:17.179] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [09:30:17.207] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [09:30:17.265] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [09:30:17.331] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [09:30:17.429] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [09:30:17.487] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [09:30:17.554] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [09:30:17.612] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [09:30:17.669] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [09:30:17.809] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [09:30:17.912] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [09:30:17.976] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted