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Object reference not set to an instance of an object

Hello all,

I am attempting to create a new application monitor template with a file existence component monitor. When I test the component I am receiving the following error message:

Object reference not set to an instance of an object.

System.NullReferenceException: Object reference not set to an instance of an object. at System.IO.Directory.GetDemandDir(String fullPath, Boolean thisDirOnly) at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler) at System.IO.Directory.GetFiles(String path, String searchPattern) at SolarWinds.APM.Probes.FileExistenceProbe.CheckFile (String path) at SolarWinds.APM.Probes.FileExistenceProbe.FileProbeInternal (String path, UserNamePasswordCredential cred, PortMonitorResult result) at SolarWinds.APM.Probes.FileExistenceProbe.FileProbe (String path, UserNamePasswordCredential cred, ProbeResultBase result) at SolarWinds.APM.Probes.FileProbeBase`1.Probe (ProbeInformation probeInfo, ProbeResultBase result)

I have other file monitors which work with no issues. Any suggestions?

Current environment:

- 1 primary polling servers with 4 additional polling engines.

- Dedicated SQL2005 database server.

- An additional web console. Windows 2003 standard edition.

- Primary poller is Windows 2008 R2 64bit standard edition.

- Additional pollers are Windows 2003 R2 standard edition

- Dedicated SQL server Windows 2003 R2 64bit with 30GB RAM

Orion Core 2012.1.1,

SAM 5.2.0,

NPM 10.3.1,

IVIM 1.4.0

I have opened support case # 414884 and gathered diagnostics on my primary polling server.

Best regards!

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aLTeReGo

The information contained within this error is too vague to properly diagnose via Thwack. I think you're on the right track opening a case with support. Please post back the resulting findings of your case here once your case is closed. Thanks!

bmills99

Many thanks to SW support for assistance with this issue. Upon working with support it was found that the file monitor was attempting to check the existence of a file on the target node on a path that was not valid. My apologies, I thought I had tested this before I opened support case.

Sorry about that and best regards.

markvanber

An Object is an instance of a Class , it is stored some where in memory. A reference is what is used to describe the pointer to the memory location where the Object resides. The message "object reference not set to an instance of an object" means that you are referring to an object the does not exist or was deleted or cleaned up. It's usually better to avoid a NullReferenceException than to handle it after it occurs. To prevent the error, objects that could be null should be tested before being used.

if (mClass != null)
{
// Go ahead and use mClass
mClass.property = ...
}
else
{
// Attempting to use mClass here will result in NullReferenceException
}