After upgrading the AAI Reporting Server from 1.x to 2.0, you must go through configuration steps again in the AAI Website.
You may see the error below during the first step of the configuration:
"Validation failed on Report server: invalid user input, please verify the fields first."
AAI Release : 6.4.5
Reporting Server Release: 2.0
After the upgrade of AAI and the reporting server complete make sure to restart the AAI service again once the Reporting Server is upgraded, and also Clear the browser cache.