Zohosheet API problem

Zohosheet API problem

I'm trying to create dynamic charts as described in "Creating charts using Zoho Sheet API" but the returned chart doesn't show any data. (See attached) The command used was http://sheet.zoho.com/zohochart.do?&charttype=LINE&chartdata=1,2,3,4,5,6,7,8,9 and should retrun a line chart with a diagonal line but no line is present. Am i doing something wrong in the code?