I’m currently in the process of writing a report using boosted regression trees. I’m currently using guidelines provided by Elith et al here, and here They provide the function gbm.step, which performs 10-fold cross validation on the boosted regression tree. It also has a nifty gbm.plot function, producing partial dependence plots. Unforunately, it kept giving me this error: Error: could not find function "windows" This means that the function windows() is being called inside …