Top N Source/Destination/Application Graphs Empty

My NetFlow Analyzer 9 server filled up on disk space yesterday. I made the data retention parameters as follows to remedy it:

Raw Data Retention: 1 week
One Minute Data Storage Settings: 1 Month

Now, I have the following situation:
My Top N Source/ Top N Destination and Top Application graphs all say "no data to display".

The log file at /opt/ManageEngine/NetFlow/server/default/log/serverout0.log is giving me the following error, but I'm not sure if it's related:
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Table 'netflow.Conversation10Min' doesn't exist

My disk utilization is at 25% (around 450 GB available) after the retention changes I made. This seems to me like it could be a database corruption issue. Where should I start looking to fix this problem?

Regards,

Paul