set key for database config to 0

phantom-wiki-v050.py

@@ -173,6 +173,7 @@ class PhantomWiki(datasets.GeneratorBasedBuilder):
             with open(filepath, encoding="utf-8") as f:
                 data = f.read()
                 # NOTE: Our schema expects a dictionary with a single key "content"
+                key = 0
                 yield key, {
                     "content": data,
                 }