Getting undefined error for current document in script

Question

I'm getting a "Error Number: 2" "Error String: myDoc is undefined" in my script.
I tweaked some scripts so they traverse my entire book, and open up every section (document) in my book and run the code for each section.ext
The code runs great and opens and closes sections where it doesn't find text to add links to, but once it opens a document and finds text that it CAN add links to, it throws that error.  Below is my code:
main();
exit();
function main() {
    var myBook = app.activeBook,
            myDocs = myBook.bookContents.everyItem().getElements(),
            myDoc,
            myHyperlinkStyle,
            myCount = 0;
    for (var i=0; i< myDocs.length; i++) {
        myDoc = app.open(File("\\\\computerOnNetwork\\c$\\Folder\\" + myDocs[i].name));
        myHyperlinkStyle = myDoc.characterStyles.item("linkstyle");
        try {
            var script = app.activeScript;
        } catch(err) {
            var script = File(err.fileName);
        var myScriptFolderPath = script.path;
        var myFindChangeFile = new File(myScriptFolderPath + "/SearchTextAndUrls.txt"); //mac path for users desktop //File.openDialog("Choose the file containing the tab separated list");
        //alert(myFindChangeFile)
        myFindChangeFile = File(myFindChangeFile);
        var myResult = myFindChangeFile.open("r", undefined, undefined);
        if(myResult == true){
            app.findTextPreferences = NothingEnum.nothing;
            app.changeTextPreferences = NothingEnum.nothing;
            //Loop through the find/change operations.
            do {
                //read 1 line into myLine
                myLine = myFindChangeFile.readln();
                myFindChangeArray = myLine.split("\t");
                //The first field in the line is the value to find
                myFindVal = myFindChangeArray[0];
                // second is the url
                myFindUrl = myFindChangeArray[1];
                doSearchAndReplace(myFindVal, myFindUrl, app.activeDocument);
            } while(myFindChangeFile.eof == false);
                myFindChangeFile.close();
                // reset search
                app.findTextPreferences = NothingEnum.nothing;
                app.changeTextPreferences = NothingEnum.nothing;
        alert("Done! " + myCount + " hyperlinks have been added.");
        myDoc.close();
function doSearchAndReplace(stringfind, urlstring, searchin) {
    app.findTextPreferences.findWhat = stringfind;
    //Set the find options.
    app.findChangeTextOptions.caseSensitive = false;
    app.findChangeTextOptions.includeFootnotes = false;
    app.findChangeTextOptions.includeHiddenLayers = false;
    app.findChangeTextOptions.includeLockedLayersForFind = false;
    app.findChangeTextOptions.includeLockedStoriesForFind = false;
    app.findChangeTextOptions.includeMasterPages = false;
    app.findChangeTextOptions.wholeWord = false;
    var myFoundItems = searchin.findText();
    for (i = 0; i < myFoundItems.length; i++) {
        var myHyperlinkDestination = myMakeURLHyperlinkDestination(urlstring);
        myMakeHyperlink(myFoundItems[i], myHyperlinkDestination);
        myFoundItems[i].applyCharacterStyle(myHyperlinkStyle, false);
        myCount++
function myMakeHyperlink(myFoundItem, myHyperlinkDestination){
    try {
        var myHyperlinkTextSource = myDoc.hyperlinkTextSources.add(myFoundItem);
        var myHyperlink = myDoc.hyperlinks.add(myHyperlinkTextSource, myHyperlinkDestination);
        myHyperlink.visible = false;
    catch(myError){
function myMakeURLHyperlinkDestination(myURL){
    //If the hyperlink destination already exists, use it;
    //if it doesn't, then create it.
    try{
        var myHyperlinkDestination = myDoc.hyperlinkURLDestinations.item(myURL);
        myHyperlinkDestination.name;
    catch(myError){
        myHyperlinkDestination = myDoc.hyperlinkURLDestinations.add(myURL);
    myHyperlinkDestination.name = myURL;
    //Set other hyperlink properties here, if necessary.
    return myHyperlinkDestination;
Any and all help is greatly appreciated!

Answer 1

This ended up being my fixed/final code:
main();
exit();
function main() {
    var myBook = app.activeBook,
            myDocs = myBook.bookContents.everyItem().getElements(),
            myDoc,
            myHyperlinkStyle;
    for (var i=0; i< myDocs.length; i++) {
        myDoc = app.open(File("\\\\computerOnNetwork\\c$\\Folder\\" + myDocs[i].name));
        myHyperlinkStyle = myDoc.characterStyles.item("linkstyle");
        try {
            var script = app.activeScript;
        } catch(err) {
            var script = File(err.fileName);
        var myScriptFolderPath = script.path;
        var myFindChangeFile = new File(myScriptFolderPath + "/SearchTextAndUrls.txt"); //mac path for users desktop //File.openDialog("Choose the file containing the tab separated list");
        //alert(myFindChangeFile)
        myFindChangeFile = File(myFindChangeFile);
        var myResult = myFindChangeFile.open("r", undefined, undefined);
        if(myResult == true){
            app.findTextPreferences = NothingEnum.nothing;
            app.changeTextPreferences = NothingEnum.nothing;
            //Loop through the find/change operations.
            do {
                //read 1 line into myLine
                myLine = myFindChangeFile.readln();
                myFindChangeArray = myLine.split("\t");
                //The first field in the line is the value to find
                myFindVal = myFindChangeArray[0];
                // second is the url
                myFindUrl = myFindChangeArray[1];
                doSearchAndReplace(myFindVal, myFindUrl, app.activeDocument, myDoc, myHyperlinkStyle);
            } while(myFindChangeFile.eof == false);
                myFindChangeFile.close();
                // reset search
                app.findTextPreferences = NothingEnum.nothing;
                app.changeTextPreferences = NothingEnum.nothing;
        alert("Done! Hyperlinks have been added.");
        myDoc.close();
function doSearchAndReplace(stringfind, urlstring, searchin, myDoc, myHyperlinkStyle) {
    app.findTextPreferences.findWhat = stringfind;
    //Set the find options.
    app.findChangeTextOptions.caseSensitive = false;
    app.findChangeTextOptions.includeFootnotes = false;
    app.findChangeTextOptions.includeHiddenLayers = false;
    app.findChangeTextOptions.includeLockedLayersForFind = false;
    app.findChangeTextOptions.includeLockedStoriesForFind = false;
    app.findChangeTextOptions.includeMasterPages = false;
    app.findChangeTextOptions.wholeWord = false;
    var myFoundItems = searchin.findText();
    for (i = 0; i < myFoundItems.length; i++) {
        var myHyperlinkDestination = myMakeURLHyperlinkDestination(urlstring, myDoc);
        myMakeHyperlink(myFoundItems[i], myHyperlinkDestination, myDoc);
        myFoundItems[i].applyCharacterStyle(myHyperlinkStyle, false);
function myMakeHyperlink(myFoundItem, myHyperlinkDestination, myDoc){
    try {
        var myHyperlinkTextSource = myDoc.hyperlinkTextSources.add(myFoundItem);
        var myHyperlink = myDoc.hyperlinks.add(myHyperlinkTextSource, myHyperlinkDestination);
        myHyperlink.visible = false;
    catch(myError){
function myMakeURLHyperlinkDestination(myURL, myDoc){
    //If the hyperlink destination already exists, use it;
    //if it doesn't, then create it.
    try{
        var myHyperlinkDestination = myDoc.hyperlinkURLDestinations.item(myURL);
        myHyperlinkDestination.name;
    catch(myError){
        myHyperlinkDestination = myDoc.hyperlinkURLDestinations.add(myURL);
    myHyperlinkDestination.name = myURL;
    //Set other hyperlink properties here, if necessary.
    return myHyperlinkDestination;