用Delphi作选择集，选择区域为以点（x,y)为中心的矩形区域。为何提示“未指定的错误

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用Delphi作选择集，选择区域为以点（x,y)为中心的矩形区域。为何提示“未指定的错误”？[br]var sset:OleVariant;

Procedure  TFormEdit.DoTrimBeam(x,y:double);
var FilterType,FilterData,gpCode,dataValue:variant;
var Point,point1,point2:variant;
var i:integer;
begin
    sset:=ac.SelectionSets.Add('SS1');
    Point:=VarArrayCreate([0, 11], vardouble);
    gpCode:=VarArrayCreate([0, 4], varInteger);
    dataValue:=VarArrayCreate([0, 4], varVariant);
    FilterType:=VarArrayCreate([0, 4], varInteger);
    FilterData:=VarArrayCreate([0, 4], varVariant);
    point1:=VarArrayCreate([0, 3], vardouble);
    point2:=VarArrayCreate([0, 3], vardouble);
    Point1[0]:=x*1000.0-2000.0oint1[1]:=y*1000.0-2000.0oint1[2]:=0.0;
    Point2[0]:=x*1000.0+2000.0oint2[1]:=y*1000.0+2000.0oint2[2]:=0.0;
    Point[0]:=x*1000.0-2000.0oint[1]:=y*1000.0-2000.0oint[2]:=0.0;
    Point[3]:=x*1000.0+2000.0oint[4]:=y*1000.0-2000.0; Point[5]:=0.0;
    Point[6]:=x*1000.0+2000.0oint[7]:=y*1000.0+2000.0oint[8]:=0.0;
    Point[9]:=x*1000.0-2000.0oint[10]:=y*1000.0+2000.0oint[11]:=0.0;
    gpCode[0]:=8 ;
    dataValue[0]:=LayerConcreteColumn;
    gpCode[1]:=8;
    dataValue[1]:=LayerConcreteColumn;
    gpCode[2]:=8;
    dataValue[2]:=LayerConcreteColumnA;
    gpCode[3]:=8;
    dataValue[3]:=LayerConcreteColumnKZ;
    gpCode[4]:=8;
    dataValue[4]:=LayerConcreteColumnKZA;
    for i:=0 to 4 do
    begin
      FilterType:=gpCode;
       FilterData:=dataValue;
    end;

    sset.SelectByPolygon(1,Point,FilterType,FilterData);


end;