KB36440: The Error "Message not found in user history list. It may have been deleted from other session already" and "The object specified by %1 is not found in the pool" Appears when Executing Multiple Reports using the MicroStrategy Task Framework API

SYMPTOM:
When using the reportExecute task to execute multiple reports with the same session, users may receive the following task error status code:
 

<taskResponse statusCode="500" errorMsg="(Message not found in user history list. It may have been deleted from other session already. Please refresh your history list.Message not found in user history list. It may have been deleted from other session already. Please refresh your history list.)" taskErrorCode="-2147468986">
</taskResponse>

The getSessionState task URL appears similar to this:

http://appserver:7373/MicroStrategy/servlet/taskAdmin?
taskId=getSessionState
&taskEnv=xml
&taskContentType=xml
&server=servername
&port=0
&project=Strategy+Tutorial
&uid=administrator
&pwd=
&authMode=1

 
The resulting session state is then used in the reportExecute task URL:  

http://AppServer:7373/MicroStrategy/servlet/taskAdmin?taskId=reportExecute&taskEnv=html&taskContentType=html&sessionState=0.00000001ccf0d3a13f36099bbfba30076081c193869cb6a55163e500d387bfd9cf309805df803e20b2132a77c173d5493234fce8f089ae9e0d5215f69a2a899ef7e2809e0f465b6e4e5c97fc46e5cf9066913ac2d3e2bc6d5d5cbe4c134996fac74bff26510539eeb1b26852433bf0d7ad5cb800867771b16fd05862cc4954ef53bf2f892ec3961ca2ea935c.1033.0.1.America%2FNew*_York.prun*_1*_wps*_1.0.1.1.Strategy+Tutorial.E59BC8F446B48D05D825DB9E148067F6.0-1033.0.1_-1033.0.1_-1033.1.1_1.1.0&styleName=ReportGridStyle&reportViewMode=1&reportID=060A42174253FB278B82AF98348FD05B

 
Another error message that can occur is "The object specified by %1 is not found in the pool" as shown below: 

 
CAUSE:
This error will happen when the session state used in the reportExecute task did not have the rws parameter set. There is a parameter in the getSessionState task ID called 'rws' which means 'Regular workingset size'. This specifies how many memory slots should be available for report/document executions and manipulations. In the Strategy Task Administrator's builder section, the default value for the rws parameter is '1'. If a single session will be used to execute multiple reports, this parameter should be set to a number higher than 1 (for example, 5 or 10 based on the requirements)
ACTION:
To resolve this issue, include the rws parameter on the getSessionState Task URL as shown below:

http://appserver:7373/MicroStrategy/servlet/taskAdmin?
taskId=getSessionState
&taskEnv=xml
&taskContentType=xml
&server=servername
&port=0
&project=Strategy+Tutorial
&uid=administrator
&pwd=
&authMode=1
&rws=5

 
ADDITIONAL INFORMATION:
The Strategy SDK allows you to customize the standard Strategy Web interface, and extend and integrate the Strategy business intelligence functionality into other applications. However, before changing the way Strategy Web products look or behave, it is helpful to understand how the application is built. For more information regarding the Strategy Web architecture or the process of customizing Strategy Web, please refer to Strategy Developer Zone (https://www2.microstrategy.com/producthelp/previousReleases.html)
To access the Strategy Developer Zone, you must have access to the Strategy Knowledge Base, you must have purchased the Strategy SDK, and you must be current on your Strategy maintenance agreement. If you are a US-based business and believe that you satisfy all three of these conditions but you do not have access to the Strategy Developer Zone, please contact Strategy Technical Support at support@Strategy.com or at (703) 848-8700. If you are an international business, please contact Strategy Technical Support at the appropriate email address or phone number found at https://www.microstrategy.com/en/support/contact-support.
CUSTOMIZATION WARNING:
This customization is provided as a convenience to Strategy users and is only directly applicable to the version stated. While this code may apply to other releases directly, Strategy Technical Support makes no guarantees that the code provided will apply to any future or previous builds. In the event of a code change in future builds, Strategy Technical Support makes no guarantee that an updated version of this particular customization will be provided. In the event of a code change in future builds, Strategy may not be able to provide additional code on this matter even though this customization is provided at this time for this specific build. For enhancements to this customization or to incorporate similar functionality into other versions, contact your Account Executive to inquire about Strategy Consulting assistance.