Value cannot be null. Parameter name: format

Jul 30, 2009 at 8:12 AM
Hi all,
 
My Error:
 
Value cannot be null. Parameter name: format

Details: System.ArgumentNullException: Value cannot be null. Parameter name: format at System.String.Format(IFormatProvider provider, String format, Object[] args) at System.String.Format(String format, Object arg0, Object arg1) at SmartTools.Charts.ChartWebPart.RenderContents(HtmlTextWriter writer)
Can some one help me with this error..
Thanks...