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  [17:30:32.623] Benchmark with 60 resampling iterations 
INFO  [17:30:32.788] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:30:32.860] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:30:32.904] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:30:32.947] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:30:32.990] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:30:33.034] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:30:33.076] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:30:33.118] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:30:33.164] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:30:33.206] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:30:33.249] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:30:33.966] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:30:34.546] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:30:34.747] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:30:35.145] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:30:35.658] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:30:35.797] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:30:35.951] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:30:36.093] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:30:36.372] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:30:36.935] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:30:36.955] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:30:36.974] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:30:36.994] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:30:37.014] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:30:37.040] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:30:37.059] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:30:37.078] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:30:37.096] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:30:37.115] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:30:37.134] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:30:37.169] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:30:37.209] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:30:37.242] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:30:37.277] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:30:37.312] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:30:37.385] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:30:37.420] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:30:37.454] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:30:37.503] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:30:37.541] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:30:37.563] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:30:37.598] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:30:37.619] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:30:37.640] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:30:37.661] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:30:37.682] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:30:37.702] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:30:37.728] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:30:37.749] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:30:37.772] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:30:37.829] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:30:37.886] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:30:37.948] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:30:38.010] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:30:38.071] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:30:38.189] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:30:38.268] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:30:38.329] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:30:38.383] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:30:38.446] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted