I added sugarcube 2 and was doing a test run but whenever I make a choice it reads "Error: the passage "example" does not exist" even though it does. I'm a newb and don't know that much about Twine and could use some help
The letters are the same case, then it's probably a rogue character problem. By that I mean you've included spaces where there shouldn't be, certain characters are not what you think they are, or there are invisible (non-printing) characters. This is generally the result of copy-pasting from a word processor.
Comments
eg.
Good Link: Passage Title is example => [b]example[/b]
Bad Link: Passage Title is example => [b]Example[/b]
Can you post a sample file showing the issue?