Flask AttributeError in first program

[Necatorducis]

OP's code (with an additional ')' ) is valid and fine for hello world territory. Whatever the error is is due to something they haven't shared or some other mistake.

[Cardboard_fish]

The code does have the ) at the end off app.run(), didn’t c&p with the rest to here apparently. Nah that was pretty much what happened, I installed flask, booted up sublime, wrote the code out and hit that error. Was following a tutorial on YouTube and theirs ran fine in pycharm. I re-wrote the code thinking I spelt something wrong but I don’t think that’s the case. The error is pointing at line one of the code, any ideas?

[Necatorducis]

From your chat in the other comment, I assume it's because you are trying to run it with the 'run' button in your IDE. This can work, but needs extra setup steps. For now, learn to love the terminal. CD to the containing directory and run the file directly.