try to fix that gradio error

app.py

@@ -8,6 +8,9 @@ import onnxruntime as rt
 import pandas as pd
 from PIL import Image
 
+
+os.system("pip uninstall -y gradio")
+os.system("pip install gradio==3.50") 
 TITLE = "WaifuDiffusion Tagger"
 
 DESCRIPTION = """