Yeah. The problem relies in that data "RDF doesn’t match schema". Have you added a schema before loading that data? if so, you previous schema sets the Country UID not a value.
Check your schema and take a look at your data. If this is just a test env. Delete all data in Dgraph’s paths and load that data again. This looks like Dgraph’s dataset that you may have found in our repos. If from a clean load it still gives that error. I gonna check if the dataset is ok or need to be edited.