Update interfaces/smiles2iupac.py

interfaces/smiles2iupac.py

@@ -3,7 +3,7 @@ from utils import ChemicalConverter, validate_smiles2iupac, plot_mol, login
 
 def convert(access_code, chemical_name, style, validate, plot):
     if not login(access_code):
-        return "Currently, you don't have access to the service.", None, None
+        return "Currently, you don't have access to the service.", "", None
     # Initialize the ChemicalConverter
     converter = ChemicalConverter(mode="SMILES2IUPAC")
     converted_name = ""