Hello there.
This issue could be linked to a lot of factors. For example, if you changed the hosting provider, or if you migrated the site, the location of the file (path) may have been changed; or if you moved the file to a different folder, or something else entirely.
Since we can only provide support for the Lite (non-commercial) version of wpDataTables on this forum, we need to verify that you’re trying to access the table linked to an existing data source. If that’s true, you can create another table linked to an Excel, or CSV file, and then check the “content” column in the database table wp_wpdatatables database table for the newly created table.
If the path in the “Content” column is different for the newly created table, you’ll need to modify the path of the old table, so it leads to the same folder.
If you need some further assistance, please feel free to reach out to us.
