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  [22:50:00.218] Benchmark with 60 resampling iterations 
INFO  [22:50:00.402] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:50:00.490] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:50:00.523] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:50:00.569] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:50:00.617] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:50:00.682] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:50:00.730] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:50:00.777] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:50:00.826] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:50:00.880] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:50:00.916] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:50:01.568] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:50:02.158] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:50:02.776] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:50:03.328] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:50:03.829] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:50:04.313] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:50:04.752] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:50:05.230] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:50:05.782] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:50:06.298] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:50:06.313] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:50:06.328] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:50:06.344] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:50:06.360] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:50:06.376] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:50:06.391] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:50:06.406] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:50:06.428] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:50:06.443] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:50:06.457] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:50:06.485] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:50:06.512] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:50:06.539] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:50:06.571] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:50:06.600] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:50:06.629] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:50:06.657] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:50:06.723] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:50:06.749] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:50:06.774] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:50:06.789] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:50:06.803] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:50:06.816] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:50:06.831] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:50:06.852] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:50:06.866] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:50:06.881] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:50:06.894] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:50:06.910] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:50:06.926] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:50:06.971] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:50:07.011] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:50:07.050] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:50:07.095] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:50:07.135] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:50:07.181] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:50:07.251] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:50:07.320] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:50:07.364] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:50:07.405] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted