The arrow ^ is pointing to the backtick ` so usually when an error occurs like this that means it can’t find the closing backtick and/or single/double quote (whichever one you are using). So check and make sure a closing backtick ` is present and that any special characters matching the one you’re using to wrap the string within’ your argument being passed to this.log.warn() are being escaped with a backslash \ to prevent such an error.
Hopefully that helped!