Unfortunately with my laptop, I get a different error. While my password is 128 characters long... It states password should contain at least 8 characters!
perhaps temporarily change your password to a shorter string of characters until you get the Chromecast setup and UPADTED, then try again with the longer password?
Probably want to change that password now that you've made it public. Also, the setup app does not work on some phones, it didn't on mine (Razr Maxx) and I had to use my laptop to set it up. Once set up my phone connects just fine for casting.