I have tried several attempts to upload content from Excel into sf.com using the sfConnector application. (I had successfully uploaded on a previous attempt.  But in all of my subsequent attempts, including starting from scratch and reloading all of my content into a new spreadsheet, I still get the following error message:

Salesforce: Update ()

invalid Range, missing data type, or other unknown error

MALFORMED_ID: bad id NewZ55

Does anyone know what this error message is referring to?

Thanks,

JP