'Conversion Error' Exception in workflow

Hi,

I'm getting an 'Conversion Error' exception when I'm executing the workflow.
The exception comes from the class method CL_SWF_CNT_CONTAINER=>IF_SWF_CNT_CONVERSION~TO_XML.

The exception comes on the step where I'm trying to remove the zero padding of a Container element, When I remove this step from workflow it works perfectly fine. I have checked the binding of the workflow container it doesn't have error. I'm not sure I'm getting this error.

can anyone help me on this.

Thanks!!
Suvarna