Cannot use `+` with a single argument i Did you accidentally put `+` on a new line?

It seems like you are encountering an error message in your code. This error message usually occurs when you try to use the `+` operator with only one argument, which is not allowed in most programming languages. To fix this error, you need to make sure that you are using the `+` operator with at least two arguments. You may also want to check if you accidentally put the `+` operator on a new line, which can also cause this error. If you provide more details about your code and the specific error message you are seeing, I may be able to provide more specific guidance.