Cannot Add device manualy

Cannot Add device manualy

Hello.
When i try to add device manualy & entering all correct information i can see error
like this.

Verify the details given below and if proper click 'Add' button

Name : Sw-BM22-8
IPAddress : 172.16.25.39
Vendor : Cisco
Device Type : CiscoSwitch
Series : Catalyst 2950
Model : 2950T_24
OS Type : IOS
OS Version : 12.1


Device Addition Failed.















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