The named node is from a different document context

very small code. but i have problem alterin attributes.

i am trying to add new node in XML document. but it is giving error at attributes.append. i dont know why . but please help me out friends. i m stuck here. i need urgent help. please

very small code. but i have problem alterin attributes.

i am trying to add new node in XML document. but it is giving error at attributes.append. i dont know why . but please help me out friends. i m stuck here. i need urgent help. please