Visio Services was unable to refresh external data connections in this Web Drawing because of changes in the structure of ...

Visio Services was unable to refresh external data connections in this Web Drawing because of changes in the structure of an underlying data source. One or more rows with duplicate primary keys have been introduced into this data source after this Web Drawing was last saved. To resolve this issue, delete primary key duplicates or update the data connection information in this Web Drawing using Visio.