Exception occured while getting graph properties for DiskUti

Exception occured while getting graph properties for DiskUti

I've just re-install the software OpManager. For all systems I do a test of credentials and snmp and wmi pass, however, when i go to the screen shot of the pc i get no monitors and when i try to add any i get the error "Exception occured while getting graph properties for DiskUtilization"

Anyone know how to fix this?

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