I just installed Selenium WebDriver Java version 3.6.0. When I did that, FileUtils.copyFile throws a FileUtils cannot be resolved error. (Check the attachment for illustration). I'm going to revert back to Selenium WebDriver Java version 3.5.3 because it doesn't have the error

It's FileHandler.copy(File, File) now.
Thanks @barancev. Saved my day!
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It's FileHandler.copy(File, File) now.