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 columns in this data source have changed data type after this Web Drawing was last saved. To resolve this issue, restore the data types of the affected columns to their previous values or update the data connection information in this Web drawing using Visio.