Update app.py

app.py

@@ -574,7 +574,7 @@ with gr.Blocks(css=customCSS, theme=small_and_beautiful_theme) as demo:
             with gr.Row():
                 file_display = gr.File( label=None, interactive=False,  height=20, min_width=20, visible=False, scale=2)
                 upload = gr.UploadButton("📁", file_types=["image", "video", "audio"], scale=3)
-                emptyBtn = gr.ClearButton( clear_all, [user_input, chatbot, history, file_display], [file_display], value="🧹 Neue Session", scale=3)  
+                emptyBtn = gr.ClearButton([user_input, chatbot, history, file_display], [file_display], value="🧹 Neue Session", scale=3)  
 
         with gr.Column():
             with gr.Column(min_width=50, scale=1):