求大神，满篇warning该怎样解决

ymz

我在中国地图添加南海时出现了满篇的waining，附上此部分代码，
cn0res           = True
   cn0res@china     = False      ;draw china map or not
   cn0res@river     = False       ;draw changjiang&huanghe or not
   cn0res@province  = False      ;draw province boundary or not
   cn0res@nanhai    = True      ;draw nanhai or not
   cn0res@diqu      = False       ; draw diqujie or not
   cn0res@mpDataBaseVersion = "HighRes"
   cn0res@mpDataResolution = "Coarsest"
   chinamap = add_china_map(wkspcanndif,plotpcanndif(i),cn0res)


warning:TransformPostDraw: tfPolyDrawList element 641 is invalid
warning:TransformPostDraw: tfPolyDrawList element 642 is invalid
warning:TransformPostDraw: tfPolyDrawList element 643 is invalid
warning:TransformPostDraw: tfPolyDrawList element 644 is invalid
warning:TransformPostDraw: tfPolyDrawList element 645 is invalid
warning:TransformPostDraw: tfPolyDrawList element 646 is invalid
warning:TransformPostDraw: tfPolyDrawList element 647 is invalid
warning:TransformPostDraw: tfPolyDrawList element 648 is invalid
warning:TransformPostDraw: tfPolyDrawList element 649 is invalid
warning:TransformPostDraw: tfPolyDrawList element 650 is invalid
warning:TransformPostDraw: tfPolyDrawList element 651 is invalid
warning:TransformPostDraw: tfPolyDrawList element 652 is invalid
warning:TransformPostDraw: tfPolyDrawList element 653 is invalid
warning:TransformPostDraw: tfPolyDrawList element 654 is invalid
warning:TransformPostDraw: tfPolyDrawList element 655 is invalid
warning:TransformPostDraw: tfPolyDrawList element 656 is invalid
warning:TransformPostDraw: tfPolyDrawList element 657 is invalid
warning:TransformPostDraw: tfPolyDrawList element 658 is invalid
warning:TransformPostDraw: tfPolyDrawList element 659 is invalid
warning:TransformPostDraw: tfPolyDrawList element 660 is invalid
warning:TransformPostDraw: tfPolyDrawList element 661 is invalid
warning:TransformPostDraw: tfPolyDrawList element 662 is invalid
warning:TransformPostDraw: tfPolyDrawList element 663 is invalid
warning:TransformPostDraw: tfPolyDrawList element 664 is invalid
warning:TransformPostDraw: tfPolyDrawList element 665 is invalid
warning:TransformPostDraw: tfPolyDrawList element 666 is invalid
warning:TransformPostDraw: tfPolyDrawList element 667 is invalid
warning:TransformPostDraw: tfPolyDrawList element 668 is invalid
warning:TransformPostDraw: tfPolyDrawList element 669 is invalid
warning:TransformPostDraw: tfPolyDrawList element 670 is invalid
warning:TransformPostDraw: tfPolyDrawList element 671 is invalid
warning:TransformPostDraw: tfPolyDrawList element 672 is invalid

river

一看就有技术，发几行代码竟然能@到我。但是我爱莫能助啊，NCL不会