I installed and configured moodle 1.9 successfully. The system was up and running for about a week w/out any errors. I now get the message below when I click on the login link on the home page to login:
============
Page Not Found
We cannot locate the page you're looking for. Please check the address and make sure all letters are lowercased with no spaces. You may also move to a different page by using the links in the menu bar above.
======================
Can anyone tell me how to correct this error?