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  [17:27:30.257] Benchmark with 60 resampling iterations 
INFO  [17:27:30.424] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:27:30.493] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:27:30.542] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:27:30.588] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:27:30.643] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:27:30.687] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:27:30.730] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:27:30.771] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:27:30.819] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:27:30.863] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:27:30.906] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:27:31.233] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:27:31.776] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:27:32.363] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:27:32.561] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:27:33.204] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:27:33.357] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:27:33.512] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:27:33.661] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:27:34.287] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:27:34.593] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:27:34.613] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:27:34.632] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:27:34.669] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:27:34.706] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:27:34.743] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:27:34.764] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:27:34.783] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:27:34.803] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:27:34.823] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:27:34.858] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:27:34.926] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:27:34.997] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:27:35.072] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:27:35.115] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:27:35.154] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:27:35.252] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:27:35.323] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:27:35.392] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:27:35.427] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:27:35.463] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:27:35.481] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:27:35.505] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:27:35.524] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:27:35.543] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:27:35.561] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:27:35.581] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:27:35.601] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:27:35.637] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:27:35.688] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:27:35.730] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:27:35.844] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:27:35.949] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:27:36.013] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:27:36.069] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:27:36.150] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:27:36.254] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:27:36.310] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:27:36.370] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:27:36.473] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:27:36.548] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted