Error 1002 Creating Invoice

Error 1002 Creating Invoice

While creating invoice I am passing the basic required parameters but I am getting 1002 Contact does not exist. as error in response. Can anybody please tell what might be the issue?

Passing following json 

"{'customer_id':557604000000039040,'line_items':[{'name':'TV Guide','rate':5,'quantity':1,'item_total':5}]}"