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Home > Success Center > Network Performance Monitor (NPM) > Business Layer Error - Could not load file or assembly SolarWinds.Orion.Core.Discovery

Business Layer Error - Could not load file or assembly SolarWinds.Orion.Core.Discovery

Created by Harry Griffiths, last modified by Rodim Suarez on Jul 07, 2016

Views: 1,697 Votes: 0 Revisions: 5

Updated

Overview

The following error appears when inspecting the business layer.log file (C:\ProgramData\SolarWinds\Logs\Orion\BusinessLayerHost.log):

System.IO.FileNotFoundException: Could not load file or assembly
'SolarWinds.Orion.Core.Discovery, Version=2015.1.35100.9209, Culture=neutral,
PublicKeyToken=null' or one of its dependencies.
The system cannot find the file specified.
File name: 'SolarWinds.Orion.Core.Discovery, Version=2015.1.35100.9209,
Culture=neutral, PublicKeyToken=null'

Environment

NPM 11.5.3

Cause 

The SolarWinds.Orion.DiscoveryPlugin.dll file was not moved to the correct directory during last upgrade.

This could be due to an antivirus or other scanning software interfering or permissions on the folders.

Resolution

  1. Stop all Orion services using Orion Service Manager.

  2. Manually copy the SolarWinds.Orion.Core.Discovery.Plugin.dll to the correct directory.
    It can be found here: Volume:\program files x86\SolarWinds\Orion\Discovery

  3. Copy it to the root directory: Volume:\program files x86\SolarWinds\Orion

  4. Start all Orion services using Orion Service Manager.

 

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