After using an ExtendScript (via ESTK) Illustrator becomes corrupted and "Can't open illustration."

var folder = Folder.selectDialog();                     // Ask for a folder choice.

var aDoc = app.activeDocument;                        // Declare an active Document reference.

var textLayer = aDoc.layers.getByName('text');   // Get the text layer, for moving it back/forward

var textFrms = aDoc.textFrames;                       // Get all text frames, for language swap

var allSymbols = aDoc.symbols;                         // Get array of all symbols in the symbol library

var allSymbolItems = aDoc.symbolItems;            // Get an array of all symbol instances in the active document

var helpTextArray =

{

    en: "help",

    az: "Kömək",

    cs: "Nápověda",

    da: "Hjælp",

    de: "hilfe",

    el: "Bοήθεια",

    en: "help",

    es: "ayuda",

};

    /*

        * There's normally 3 arrays with many more languages / translations

        */

if( aDoc &&                                      // We have an activeDocument

     folder &&                                    // and we have a selected output folder

     allSymbols.length > 0 &&             // We've got symbols

     allSymbolItems.length > 0 &&      // and we've got symbol instances "symbolItems"

     textFrms.length > 0 ) {                 // and we've got textFrames to manipulate.

    // For each symbol in our symbol library...

    for(var i = 0; i < allSymbols.length; i++) {

        // Run through all instances of symbols (symbolItems), and replace with a different symbol.

        for(var ii = 0; ii < allSymbolItems.length; ii++) {

            // Move text layer out of the line of fire.

            $.writeln('Move text to back');

            textLayer.zOrder(ZOrderMethod.SENDTOBACK);

            var currObj = allSymbolItems[ii];

            var newObj = aDoc.symbolItems.add(aDoc.symbols[i]);

            var symbolColor = aDoc.symbols[i].name;

            // Add the new / replacement symbol.

            newObj.left = currObj.left;

            newObj.top = currObj.top;

            newObj.width = currObj.width;

            newObj.height = currObj.height;

            // Remove the old symbol.

            currObj.remove();

            // Bring text back up to the front.

            $.writeln('Bring text to front');

            textLayer.zOrder(ZOrderMethod.BRINGTOFRONT);

            redraw();

            $.sleep(10)

        }

        // Run through each language and each buttonText and save a copy.

        var currArray = helpTextArray;

        var currArrayName = "help";

        for(currLang in currArray) {

            switchText(currLang, currArray);

            $.sleep(10)

            // Run function to save .pngs of each artboard

            exportAll(currLang, symbolColor, currArrayName);

        } // end for (currLang in currArray)

    } // end symbols.length

} // end if

function switchText(lang, array) {

    //var textFrms = activeDocument.textFrames;

    var newText = array[lang];

    newText = (newText === "") ? array["en"] : newText;

    for(var i = 0; i < textFrms.length; i++) {

        var isHorizontal = ( textFrms[i].width > textFrms[i].height );

        var scale = 100;

        var scaleMatrix;

        textFrms[i].contents = newText;

        /*

           * There's normally an automatic text-resizer here

           */

    } // for var i

}

function exportAll(lang, color, buttonText) {

    var artBds = aDoc.artboards;

    var options = new ExportOptionsPNG24();

        options.antiAliasing = true;

        options.transparency = true;

        options.artBoardClipping = true;

    for(var i = 0; i < artBds.length; i++) {

         var currBoard = artBds.setActiveArtboardIndex(i);

         var buttonPosition =  artBds[i].name;

         var newFile = new File(folder.fsName+"/"+buttonText+"_"+color+"_"+buttonPosition+"_"+la ng+".png");

         aDoc.exportFile(newFile,ExportType.PNG24,options);

         $.writeln('A file was saved with the name:: '+buttonText+'_'+color+'_'+buttonPosition+'_'+lang+'.png');

         $.sleep(10)

     }

}

function revertToOriginal() {

    $.writeln('Revert');

    // Switch the text back to help.

    switchText("en", helpTextArray);

    // For each symbol instance...

    for(var i = 0; i < allSymbolItems.length; i++) {

        // Move text layer out of the line of fire.

        $.writeln('Move text to back');

        textLayer.zOrder(ZOrderMethod.SENDTOBACK);

        var currObj = allSymbolItems[i];

        // Add in the placeholder since we're reverting.

        var newObj = aDoc.symbolItems.add(aDoc.symbols[0]);

        var symbolColor = aDoc.symbols[0].name;

        // Add the new / replacement symbol.

        newObj.left = currObj.left;

        newObj.top = currObj.top;

        newObj.width = currObj.width;

        newObj.height = currObj.height;

        // Remove the old symbol.

        currObj.remove();

        // Bring text back up to the front.

        $.writeln('Bring text to front');

        textLayer.zOrder(ZOrderMethod.BRINGTOFRONT);

        redraw();

        $.sleep(10)

    }

        $.writeln('REVERT');

}

revertToOriginal();