same i have that problem to
When I try to access your profile from codecademy.com I get a 404 error. I have found that many people who can get connected to the courses have that problem.
Have you ever deleted your account?
How do you signin, with Facebook, Google, Twitter or Email?
Can you think of anything odd that has ever happens with your account?
In the meantime you could try this little trick to create a new account and see if that one lets you in.
You can modify your email address76 and use that to sign up for a new Codecademy account. For example, if your email was firstname.lastname@example.org, you can modify it to email@example.com, and then sign up for a new Codecademy account using firstname.lastname@example.org.