After installing Nexus Dashboard, add ACI Site, and then I upgraded the Nexus Dashboard Frimware 2.0.2g to 2.3.2 because of the matrix. There was a problem during the upgrade. so i re-imaged to 2.2.2 successfuliy.
However, this message appears when i try to add Site. 'Site not available,Site already Resistered:Response error:400'
How can i solve this problem?