Failure : Problem while fetching network list from system

Failure : Problem while fetching network list from system

Hi everybody
We have just upgrade our ManageEngine ServiceDesk from 8211 to 8213 ( in two steps, first in 8212 and then in 8213 ).
 
Now that the upgrade is done, I have an error message when I go to Admin\Discovery\Network Scan :
 
 
 
 
 
 
 
I have the same message when I go to the CMDB, choose a printer, and try to use the button "scan now" (same problem when I try to scan a single computer). I never had this problem before ( we have some audits 3 times per week before, and never have any error message ).
 
Do you have any idea to solve this problem ? Just clear caches, but does'nt help.
I can send you the support file if you want. :)
 
Thanks by advance
Regards
Michaël
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