Update gradio_demos/modules.py

gradio_demos/modules.py

@@ -194,7 +194,7 @@ class ExampleDemo(WebcamDemo):
         self.anonymizer = anonymizer
         kwargs = dict(source=source)
         if source is None:
-            kwargs.pop(source)
+            kwargs.pop("source")
         with gradio.Row():
             input_image = gradio.Image(type="pil", **kwargs)
             output_image = gradio.Image(type="numpy", label="Output")