Article ID: 2568557 - View products that this article applies to.
Consider the following scenario:
System.NullReferenceException was unhandled
Message=Object reference not set to an instance of an object.
This issue occurs because an event or command activity is initiated before the question message has completed playing. Then, internal events occur out of order and cause an unhandled runtime exception in the Windows workflow platform.
To resolve this issue, install the following update.
The following files are available for download from the Microsoft Download Center:
Download the UcmaWorkflowRuntime.msp package now.
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Release Date: April 2012
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
(http://support.microsoft.com/kb/119591/ )How to obtain Microsoft support files from online services
Article ID: 2568557 - Last Review: April 9, 2012 - Revision: 3.0