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  [17:25:39.313] Benchmark with 60 resampling iterations 
INFO  [17:25:39.483] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:25:39.549] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:25:39.591] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:25:39.634] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:25:39.676] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:25:39.719] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:25:39.761] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:25:39.802] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:25:39.855] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:25:39.900] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:25:39.943] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:25:40.508] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:25:40.863] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:25:41.472] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:25:41.750] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:25:41.906] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:25:42.340] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:25:42.766] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:25:42.921] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:25:43.301] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:25:43.829] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:25:43.881] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:25:43.914] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:25:43.945] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:25:43.981] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:25:44.033] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:25:44.067] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:25:44.102] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:25:44.137] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:25:44.155] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:25:44.173] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:25:44.207] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:25:44.246] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:25:44.291] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:25:44.327] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:25:44.362] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:25:44.444] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:25:44.480] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:25:44.514] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:25:44.547] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:25:44.580] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:25:44.597] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:25:44.619] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:25:44.637] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:25:44.655] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:25:44.672] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:25:44.690] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:25:44.707] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:25:44.726] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:25:44.744] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:25:44.768] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:25:44.823] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:25:44.878] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:25:44.938] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:25:44.993] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:25:45.056] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:25:45.111] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:25:45.166] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:25:45.228] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:25:45.282] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:25:45.375] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted