If you already completed the Packfinder and received your assessment report, the likelihood is, that this e-mail is a system error and you should not worry.
However, you can ensure you don't miss anything.
Visit your Dashboard and check your profile completion section on the right. If the 'Complete the Packfinder' is not checked, you should click on it and go through the questionnaire.
If your Profile Completion is not 100%, then click on the steps that are incomplete.
The steps you should complete are:
Create account
Complete the Packfinder
Upload your resume
Attach your LinkedIn profile
Update your basic details
Record introduction video