Server Performance Report show no data

Hi all.
When i click report ; Server Performance Report.
and choose the Date/Time Range and click submit
It only gives me information about total calls in/out
and total off hook
*********************************************
Server Performance Report 2012-02-21 12:23:55
Time range: 2012-02-20 09:00:00 to 2012-02-20 15:30:00
---------- TOTALS, PEAKS and AVERAGES
Total Calls in/out on this server: 3215
Total Off-Hook time on this server (min): 1289.42
Average/Peak channels in use for server: /
Average/Peak load for server: /
Average USER process cpu percentage: %
Average SYSTEM process cpu percentage: %
Average IDLE process cpu percentage: %
---------- LINE GRAPH:
rows: 0 tick: 5 minutes scale: 1 minute
**************
thank you
When i click report ; Server Performance Report.
and choose the Date/Time Range and click submit
It only gives me information about total calls in/out
and total off hook
*********************************************
Server Performance Report 2012-02-21 12:23:55
Time range: 2012-02-20 09:00:00 to 2012-02-20 15:30:00
---------- TOTALS, PEAKS and AVERAGES
Total Calls in/out on this server: 3215
Total Off-Hook time on this server (min): 1289.42
Average/Peak channels in use for server: /
Average/Peak load for server: /
Average USER process cpu percentage: %
Average SYSTEM process cpu percentage: %
Average IDLE process cpu percentage: %
---------- LINE GRAPH:
rows: 0 tick: 5 minutes scale: 1 minute
**************
thank you