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Home > Success Center > Server & Application Monitor (SAM) > SAM - Knowledgebase Articles > Cannot write reports or assign templates Error ; http://OrionServerName:8080/Orion/APM/Admin/Templates/Assign/SelectCredentialsAndTest.aspx Message: Value cannot be null

Cannot write reports or assign templates Error ; http://OrionServerName:8080/Orion/APM/Admin/Templates/Assign/SelectCredentialsAndTest.aspx Message: Value cannot be null

Updated September 20th, 2017

Overview

When trying to write report or edit a template in SAM get the following web error

Error: 
URL: http://OrionServerOrion/APM/Admin/Templates/Assign/SelectCredentialsAndTest.aspx
Referrer:http://OrionServer/Orion/APM/Admin/Templates/Assign/SelectCredentialsAndTest.aspx
Message: Value cannot be null.
         Parameter name: source
ErrorSite: System.Core.Enumerable.Select
ErrorType: System.ArgumentNullException
Stack: 
at System.Linq.Enumerable.Select[TSource,TResult](IEnumerable`1 source, Func`2 selector)
at Orion_APM_Admin_Templates_Assign_SelectCredentialsAndTest.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, 
Boolean includeStagesAfterAsyncPoint)

 

 

Environment

  • SAM
     

 

Cause 

 The Maximum Worker Processes setting value for SolarWinds Orion Application pool should be set to 1 to work with the default configuration. 

Resolution

  1. Open Internet Information Services Manager.
  2. Browse to the  Application pools and expand
  3. Right click on the  SolarWinds Orion server application pool and select Advanced Settings.
  4. Set the Maximum number of worker processes of the default application pool to 1.

 

 

 

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