SAN HQ Estimated IOPS cannot be calucated

I've been monitoring our PS4400XV (Firmware V5.0.7) with SAN HQ 2.1.0.5342 for weeks already. All information seems collected properly. 

However, in Experimental Analysis window,  when I mouse-over the graph, it says that :

Invalid configuration is detected. Estimated Max IOPS cannot be calculated.

Any solution?

Thanks a lot.