WPF数据库错误:无法找到与引用'RelativeSource FindAncestor'绑定的源

I get the following errors from the code below... not sure why (and yes, it produces all 4 even though it's the same 2 repeated). Oh, and it doesn't produce the alternating rows effect, even though prior to these errors popping up the same code was working.I get the following errors from the code below.