How to retrieve benchmark results from makeExperimentRegistry()

I am trying to use mlr with batchtools to conduct benchmarking. In order to generate a prediction on the benchmarked results from batchtools, I need to retrieve the benchmark results. Using reduceResultsList doesn't work with mlr's generateThreshVsPerfData. Is there another function to retrieve the results? Because results from reduceResultsList() is not acceptable in MLR to generate ROC curve.

#retrieve benchmark result
result = reduceResultsList(ids = c(c(1:284), c(286:318)), reg = regis, missing.val = NA)
Reducing [===================================================================================================>] 100% eta: 0s>

df = generateThreshVsPerfData(result, measures = list(fpr, tpr, mmce))
Error in generateThreshVsPerfData.list(result, measures = list(fpr, tpr, :
Assertion on 'obj' failed: May only contain the following types: Prediction,ResampleResult.

Start with makeExperimentRegistry() and the reduceResultsList() and generateThreshVsPerfData() calls shown in the issue. Review batchtools and mlr result-handling documentation to identify the compatible benchmark result representation; done means the retrieved results can be passed to generateThreshVsPerfData without the reported type assertion error.