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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > NetPath_40037 error after NPM 12.1 upgrade

NetPath_40037 error after NPM 12.1 upgrade

Updated June 7, 2017

Overview

The Netpath_40037 error message is displayed in the Microsoft Events Viewer after upgrading to NPM 12.1. The following is an example of the error:

ErrorCode: NetPath_40037

Message: Add: 

Exception: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()

at SolarWinds.NetPath.Data.Repository.Models.ViewModels.TraceRouteStatistics.Add(ITraceRouteStatistics statisticsToAdd)

Environment

NPM 12.1

Cause 

This is a known issue in NPM 12.1 where modifications and iterations in a collection are done at the same time.

Resolution

Apply NPM 12.1 Hotfix 1 on your Orion server.

 

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