pads2007错误检查提示问题

小弟用pads2007画的板，检查错误的时候很多都是类似的提示：(45.81836,44.0495 L2)Distance between tracks too small:copper(0,44.5),copper(0,44.05)overlapping，请问这是什么意思啊?先行谢过了！

走线和铜皮间距错误。