You could have the wrong username and password combination, or just a typo. Please try logging in one more time.
If that still doesn't work, there's an easy fix:
Step 1. Login to Squidoo and reset your account password there.
Step 2. Then come back here and login to SquidU using the new password.
Voila! Squidoo and SquidU will share the same login username and password going forward.