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Home > Success Center > Netflow Traffic Analyzer (NTA) > NTA - Knowledgebase Articles > ERROR SolarWinds.Orion.NetFlow.Service.Program - Unhandled exception: Message: Invalid class

ERROR SolarWinds.Orion.NetFlow.Service.Program - Unhandled exception: Message: Invalid class

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Created by Con Finucane, last modified by Rodim Suarez_ret on Mar 10, 2017

Views: 284 Votes: 1 Revisions: 3

Updated March 10, 2017

Overview

Error in the Netflow Service logs

ERROR SolarWinds.Orion.NetFlow.Service.Program - Unhandled exception: Message: Invalid class

The particular problem is related to FastBit startup. The service is trying to check the available RAM memory via WMI and the query fails causing the service to crash.

Environment

All NTA versions

Detail

Please advise the customer to rebuild the WMI repository. It is a mandatory step to fix the issue, you may  lose some custom WMI providers if you use any.

Detailed instructions on how to fix the WMI repository can be found here: https://blogs.technet.microsoft.com/...mi-repository/

 

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