title: MLR: Function "predict.WrappedModel" not found
body: <p>I am using R 3.6.1, RStudio 1.2.5019 and mlr 2.15.0. Mlr ist installed and loaded. Only mlr and the packages mlr is built on are loaded.</p>
  
  <p>Now, I have trained a model using <code>train</code> and would like to test it on new data. 
  Therefore, I want to use the <code>predict.WrappedModel</code> function from mlr.</p>
  
  <p>If I call
  <code>?predict.WrappedModel</code> I get all the information in the help window.</p>
  
  <p>However, if I want to run <code>predict.WrappedModel</code> R throws an error indicating that the function cannot be found:</p>
  
  <p><code>my_test = predict.WrappedModel(object = my_model, task = my_task)</code></p>
  
  <blockquote>
    <p>konnte Funktion "predict.WrappedModel" nicht finden</p>
  </blockquote>
  
  <p>Even when specifying mlr as the package to look in for the function: </p>
  
  <p><code>my_test = mlr::predict.WrappedModel(object = my_model, task = my_task)</code></p>
  
  <blockquote>
    <p>Fehler: 'predict.WrappedModel' ist kein von 'namespace:mlr' exportiertes Objekt</p>
  </blockquote>
  
  <p>I also tried using <code>?predict</code> , but here I also got an error:</p>
  
  <p><code>my_test = mlr::predict(object = my_model, task = my_task)</code></p>
  
  <blockquote>
    <p>Fehler: 'predict' ist kein von 'namespace:mlr' exportiertes Objekt</p>
  </blockquote>
  
  <p>I've already spent a lot of time trying to fix this issue and read all the related questions I had found here and on the mlr forum on github, but could not find a solution.</p>
  
  <p>What am I missing here? </p>
  
  <p>Thanks a lot in advance :)</p>