Please read the pinned thread and fix the formatting of the code so that we can read it properly. (You will need to redo the copy-paste, because the forum has changed some of the text to “look nice”). Use the same formatting for the error message.
Then please carefully explain: which source code file are you showing us, and why? (Is it part of the code that you wrote, or is it part of someone else’s code that you’re trying to use?) How does it relate to your project, and why do you expect it to be connected to the error?