First things first, make sure your Flux version is up to date (at least v0.13). If not, then check your environment to see if any other dependencies are holding it back (you can search on Discourse for guides on how to do that). If everything looks there (and post your package version info here if it does so we can make sure), then post the exact code, error + stacktrace you’re encountering when trying to use DataLoader. Per Please read: make it easier to help you, “doesn’t work” is not enough to work with 