[Table width exceeds column width; table may set outside frame.]

I'm getting a series of these errors in my composition log which seem to indicate there is a problem with my tables.

 

returnStr += '<table columns="6" title="Top" alignment="right" shadestyle="by:row;first:1,Gray,75;next:1,White,0" margins="left:0;top:0;bottom:30;right:0" >';

returnStr += '<column width="10000">';

returnStr += '<column width="6000">';

returnStr += '<column width="5800" >';

returnStr += '<column width="10000">';

returnStr += '<column width="24000">';

returnStr += '<column width="5000">';

 

Does anyone know what this Error Means?