file validation

app.py

@@ -47,7 +47,12 @@ with gr.Blocks() as nps:
     def load_data(file):
         if file is not None:
             file.seek(0)  # Reset file pointer
-            custom_df = pd.read_csv(file)
+            import io
+            if file.name.endswith('.csv'):
+                content = file.read().decode('utf-8')
+                custom_df = pd.read_csv(io.StringIO(content))
+            else:
+                return "Error: Uploaded file is not a CSV."
             if 'customer_comment' not in custom_df.columns:
                 return "Error: Uploaded CSV must contain a column named 'customer_comment'"
             global df