イラストレータ起動直後にスクリプトでエラー

肩書\t名字\t名前\tメールアドレス\t1

var dir = '~/Desktop/testFolder/';
var tx="";
var baseFile, tgDoc,tgFrame;
var pdfFile,aiFile;
var tmp = [];
var flg = 0;
var f = File.openDialog("Select a text file");
if(f.open('r')){
var fileName = ["base1.ai","base2.ai","base3.ai","base4.ai"];
while(!f.eof){
tx = f.readln().split('\t');
baseFile = new File (f.parent + "/" + fileName[Number(tx[4])]);
tgDoc = open(baseFile);

tgFrame[0].contents = tx[3];
tgFrame[1].contents = tx[0];
tgFrame[2].contents = tx[1];
tgFrame[3].contents = tx[2];

pdfFile = new File(dir + tx[2] + tx[1] + ".pdf");
aiFile = new File(dir + tx[2] + tx[1]  + ".ai");
saveOpts = new PDFSaveOptions();
saveOpts.compatibility= PDFCompatibility.ACROBAT7;
saveOpts.generateThumbnails = true;
saveOpts.preserveEditability = true;
tgDoc.saveAs (pdfFile, saveOpts);
tgDoc.saveAs (aiFile);
tgDoc.close();
}
}