Update app.py

app.py

@@ -13,6 +13,7 @@ def get_data_preview(file):
     global global_data
     global_data = pd.read_csv(file.name)
     global_data['label'] = np.nan  # Initialize a label column
+    global_data['label'] = global_data['label'].astype(object)  # Ensure the label column can hold different types
     print("Data preview:\n", global_data.head())
     return global_data.head()