Update src/api/main.py

src/api/main.py

@@ -48,7 +48,7 @@ class InvalidFileTypeError(Exception):
 
 class InvalidModelError(Exception):
     def __init__(self):
-        self.message = f"Selected model doesn't exist. Please select one of: {','.join(ml_models.keys())}"
+        self.message = f"Selected model doesn't exist. Please select one of: {', '.join(ml_models.keys())}"
         super().__init__(self.message)