Receiving "error 115" indicates you have requested to create or reset your password more than once in the last 15 minutes. Multiple requests could be a result of clicking the "Submit" button more than once during this process.
Please check your email for a message from Disney.Housing.NO-REPLY@disneyparks.com that contains instructions to complete your password assistance process. If the temporary one-time-use password in the most recent email is not working, wait 30 minutes and try the “Create or reset your password” page again.
If you are not receiving emails from DORMS, check out this Article: I am not receiving emails from DORMS!