solo71 wrote:
You could proceed to the following test.

1) Create a new directory on your server.

2) Make a fresh installation of a standard Xoops.

3) See how it behaves.... If it works, the problem comes from your site. If not, the problem may comes from your server configuration.

4) Install your modules one by one, and see which one causes troubles...

snow77 wrote:
Error: Selected module does not exist! - Sometimes happens when you install a module and then for some reason you delete it from the modules folder without uninstalling it first from the admin panel. Or the URL in a custom menu is written wrong. Or the modules files did not upload completely.

If when trying to login you are redirected to this error it could be because you had set this now unexisting module as default module for your startpage in admin > preferences > general settings.

When this happens one way to login...in a tricky way, is to: 1)press USER LOGIN in the login form once without putting anything in the form, you will get a page that says Incorrect Login, and then the login form will show again in the center 2) enter your admin access 3) you should now get redirected to your View Account page.

- that is just a strange sort of way of getting logged in and not be redirected to your homepage but to your user account page. Maybe this way it can let you in.

If you're able to get in this way you would have to check what's happening to the module and see what it is you have set to be as your default homepage.

[edit] I forget this: since you disabled all blocks then after getting in just type in the url directly to admin (ex. http://localhost/xoops/admin.php)