you just uploaded a different page to the controller? you didn't modify the rest of the configuration?
can you go back and make it work again with the default page?
if it works again have a look at the page you uploaded and perhaps share it here so we can see if everything is up with it.
if you changed the configuration then have a look at the following items
the pre-logon role is configurated in the aaa profile (Security > Authentication > Profiles; Initial role)
that role has an captive portal profile attached (Security > Access Control > User Roles; Captive Portal Profile)
the captive portal has a (different) post authentication role (Security > Authentication > L3 Authentication; Default Role)