Need help with adding a list row

[Jay Whipple]

When trying to add a new row to an existing spreadsheet I keep getting:

Here is the body of POST:

<entry xmlns="http://www.w3.org/2005/Atom"; 
xmlns:gsx="http://schemas.google.com/spreadsheets/2006/extended";>

<title>Sheet1</title>

<gs:rowCount>50</gs:rowCount>

<gs:colCount>10</gs:colCount>

<gsx:hours>1</gsx:hours>

<gsx:ipm>1</gsx:ipm>

<gsx:items>60</gsx:items>

<gsx:name>Zorro</gsx:name >

</entry>

      

do I need a special xmlns:gs='????'