Netflow Application Graph not coming suddenly

Netflow Application Graph not coming suddenly

Hi,

I am using Linux based Netflow Analyzer build 9860 with embedded MYSQL. All was working fine till yesterday but today i have observed that devices interface graphs are working fine and shows graph but APPLICATION HOURLY graph is not displaying while 6 Hours APPLICATION graph is displaying fine.  

Kindly find the attached files of Hourly graph and 6 hours graphs for your reference.

Kindly advice on the said matter.
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