Update 3E - "Could not find AppObject" Extract Error

In Utilities 3E, the following error may be seen in the Update 3E - Extract process (part of Upgrades):
"Could not find AppObject. If the AppObject does exist, verify the ID matches in the MetaXML and table. There is a Stock version, but this is a Custom extract."

This error is usually due to a stock object that is added to the Project that has no custom version, i.e. no changes have been made to it. Identify the object from the error message grid and remove it from the Project in the IDE. After saving the Project, the error should no longer appear when extracting.