This error can actually be quite a few different things. I suggest opening a case with our support team
In the meantime I would suggest checking the following as they are the most common fixes :
- Update your drivers for SAP BW Driver Download | Tableau Software
- Check the configuration for SAP BW Connecting to SAP BW
- Make sure the extract is not too big
- Make sure your server meets the requirements All Technical Specifications | Tableau Software
Check that SAPLogon.INI file is present on server. This also happens when SAPLogon.INI file on server doesnt contain the connection information.