Error vai SNMP

I installed the Prizm and started to identify the network then discovered the elements then accepted these elements but unluckily for all elements I received the same error msg:“Erorr determining Element Type via SNMP. Element could not be added for management” however I added it for the management I received this msg.

Please tell me what do you think about that?

Did you managed to resolve this? Iam having this problems only with my old AP in version 7.3

If you have a solution, let me know.