I have faced this error while working on Oracle Reports Builder,trying to modify a query in the data model.
The Reasons may be :
1. A mandatory value received incorrect or null data.
2. You are not connected to the database in report builder.
This happens when we are connected to database and for some reason the connection is lost/dropped/disconnected.To overcome this error, completely close report builder and reopen it,else try going to
File -> Connect -> Give the UserName, Password, Database and connect.
Challa.
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