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000464: Cannot get exclusive schema lock. Either being edited or in use by another application.

Description

More than one user may be reading and editing the same data at the same time. To be able to work with your data, the application must be able to assume that the schema is fixed and is not changing at any time that you are working with its contents.

Solution

Check that you are exclusively using and editing your dataset. The most common cause of a schema lock is displaying a dataset while you attempt to work with the data in another application.