you cannot index dict values....

interfaces/cap.py

@@ -121,5 +121,5 @@ demo = gr.Interface(
     fn=predict_cap,
     inputs=[gr.Textbox(lines=6, label="Input"),
             gr.Dropdown(languages, label="Language", value=languages[-1]),
-            gr.Dropdown(domains.keys(), label="Domain", value=domains.values()[0])],
+            gr.Dropdown(domains.keys(), label="Domain", value=list(domains.values())[0])],
     outputs=[gr.Label(num_top_classes=5, label="Output"), gr.Markdown()])