initializing datatable produces duplicate ids

I'm using DataTables to use client side paging on an asp.net gridview.
I have a dop-down list which determines the data for the tables, when I change the value on the list I get the new gridview using ajax then replace the current gridview containers with the ones received in the ajax call then I initialize the datatables again.
the error occurs when the datatables are initialized, not when the gridview containers are replaced.
The duplicate ids are only in the header row.
any suggestions?