Error when linking text to an PDF attachment - GeneralError: Operation failed. Root.(null):xxxx:Batch undefined:Exec script terminated

I created a JavaScript code which imports files into the attachment of a pdf form, then searches for the written pdf filenames within the pdf form and links the texts to the imported files. I employ Adobe Acrobat X (10.1.16)

The code (which is run as folder-level JS)  is shown here:

var impDatObj = app.trustedFunction( function(odoc,filenme,filepth) {
app.beginPriv(); 
odoc.importDataObject(filenme,filepth); 
app.endPriv(); 
});

var attachpath="/mysrv/subdir/";

impDatObj(this, "abcdef_g.pdf", attachpath+"abcdef_g.pdf"); 
impDatObj(this, "987654_3.pdf", attachpath+"987654_3.pdf");

var numPgs = this.numPages; 
for (var jj=0; jj<numPgs; jj++) { 
    var numWords = this.getPageNumWords(jj); 
    for (var i=0; i<numWords; i++) {
        var ckWord = this.getPageNthWord(jj, i, false); 
        if (ckWord.indexOf("pdf")>=0) {
            ckWord = ckWord.substring(0,  3); 
            mm=i; 
            var spc=true; 
            do {
               mm=mm-1; 
               ckWord=this.getPageNthWord(jj, mm, false)+ckWord; 
               if (mm>0) spc=(this.getPageNthWord(jj, mm-1, false).indexOf(" ")==-1); else if (mm==0) spc=true; else spc=false; 
            } while (spc); 
        } 
        if (ckWord=="abcdef_g.pdf") { 
            var m = (new Matrix2D).fromRotated(this,jj); 
            var mInv = m.invert(); 
            var q = this.getPageNthWordQuads(jj, i); 
            var r = mInv.transform(q); 
            r = r.toString(); 
            r = r.split(","); 
            var p = this.getPageNthWordQuads(jj, mm); 
            var s = mInv.transform(p); 
            s = s.toString(); 
            s = s.split(","); 
            var l = addLink(jj, [s[4], r[5], r[2], s[3]]); 
            l.setAction("exportDataObject({cName: \"abcdef_g.pdf\", nLaunch: 2});"); 
        }
    }
}

var numPgs = this.numPages; 
for (var jj=0; jj<numPgs; jj++) {
    var numWords = this.getPageNumWords(jj); 
    for (var i=0; i<numWords; i++) {
        var ckWord = this.getPageNthWord(jj, i, false); 
        if (ckWord.indexOf("pdf")>=0) {
            ckWord = ckWord.substring(0,  3); 
            mm=i; 
            var spc=true; 
            do {
               mm=mm-1; 
               ckWord=this.getPageNthWord(jj, mm, false)+ckWord; 
               if (mm>0) spc=(this.getPageNthWord(jj, mm-1, false).indexOf(" ")==-1); else if (mm==0) spc=true; else spc=false; 
            } while (spc); 
        }
        if (ckWord=="987654_3.pdf") {
            var m = (new Matrix2D).fromRotated(this,jj); 
            var mInv = m.invert(); 
            var q = this.getPageNthWordQuads(jj, i); 
            var r = mInv.transform(q); 
            r = r.toString(); 
            r = r.split(","); 
            var p = this.getPageNthWordQuads(jj, mm); 
            var s = mInv.transform(p); 
            s = s.toString(); 
            s = s.split(","); 
            var l = addLink(jj, [s[4], r[5], r[2], s[3]]); 
            l.setAction("exportDataObject({cName: \"987654_3.pdf\", nLaunch: 2});"); 
        }
    }
}

An error arises at the command:   l.setAction("exportDataObject({cName: \"987654_3.pdf\", nLaunch: 2});");

Both documents are correclty uploaded into the attachment of the pdf form, the first text position is correctly linked.

Who can help?