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  [01:50:56.382] Benchmark with 60 resampling iterations 
INFO  [01:50:56.606] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [01:50:56.667] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [01:50:56.693] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [01:50:56.716] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [01:50:56.751] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [01:50:56.792] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [01:50:56.831] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [01:50:56.871] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [01:50:56.907] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [01:50:56.947] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [01:50:56.987] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [01:50:57.154] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [01:50:57.322] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [01:50:57.493] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [01:50:57.673] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [01:50:57.853] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [01:50:57.973] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [01:50:58.093] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [01:50:58.224] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [01:50:58.352] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [01:50:58.483] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [01:50:58.502] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [01:50:58.522] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [01:50:58.541] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [01:50:58.560] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [01:50:58.580] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [01:50:58.599] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [01:50:58.617] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [01:50:58.643] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [01:50:58.662] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [01:50:58.682] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [01:50:58.716] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [01:50:58.765] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [01:50:58.817] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [01:50:58.892] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [01:50:58.928] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [01:50:58.962] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [01:50:58.996] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [01:50:59.071] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [01:50:59.105] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [01:50:59.141] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [01:50:59.162] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [01:50:59.182] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [01:50:59.200] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [01:50:59.220] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [01:50:59.246] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [01:50:59.265] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [01:50:59.285] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [01:50:59.304] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [01:50:59.322] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [01:50:59.342] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [01:50:59.404] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [01:50:59.455] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [01:50:59.506] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [01:50:59.563] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [01:50:59.622] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [01:50:59.714] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [01:50:59.818] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [01:50:59.940] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [01:51:00.005] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [01:51:00.059] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted