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New features cannot be added to a personal geodatabase. The following error is returned:
"The <edit> task could not be completed. The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship."
The personal geodatabase was created (for example, as a result of checking out some data from another geodatabase) under a Windows operating system that has an older version of the msjet40.dll file (windows\systems32). The auto-number generator, used to allocate new ObjectIDS to the new features, has been corrupted. Attempts to add new features will result in this error. This is a known problem with msjet40.dll version 4.00.2927.4 or earlier.
Upgrade the msjet40.dll file to the latest version.
To update Jet to the newest version, see the link below.