WLC 4200 Access Points with broken graphs

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Hello Community,

I am just wondering if someone has the work around for the following problem:

I just put my Cisco WLC 4200 to start monitoring, and so far it shows me everything that I wanted to see with some exceptions.

The Connected APs graphs are broken as shown in the image bellow:

And when I click on the menu Access Points:


It brings me all the AP’s as expected but the graphs are also broken

And when I hover on the AP name it actually show me some graphs:

Is there something that I can do to get it fixed?

Thanks in advance!

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