Lol, I just added the esDataSource to the page and the error disappeared.
I suspect it has something to do with the Trial version. I had the trial version installed on my dev machine and was using the developer runtimes. I already uninstalled the trial version to see if this was the problem, but the problem persisted. I coincidentally restarted my machine because I had to change my desk-height so I guess the restart after the fresh install did the trick.