Find and delete duplicated files in Google Drive

Question

So, it's an old thread I know, but all the threads I found are older than 7 years, so it seemed like a good idea to reopen one.

My problem is that I have to delete the duplicate files in my drive because they are taking up space unnecessarily, I found this code from this old thread - How to Find duplicates files -, however it doesn't work, I wanted to ask, can you find the error? Or if you have some other solution to recommend to delete duplicates (no Clean Drive as it is paid)

Thank you

function startProcess() {
    PropertiesService.getScriptProperties().deleteAllProperties();
    try {
        ScriptApp.deleteTrigger(ScriptApp.getProjectTriggers()[0]);
    } catch (e) {}
    var sh = SpreadsheetApp.getActiveSheet();
    sh.getDataRange().clear();
    sh.getRange(1, 1, 1, 4).setValues([
        ['fileName (logged @' + Utilities.formatDate(new Date(), Session.getScriptTimeZone(), 'MMM-dd-yyyy HH:mm') + ')', 'fileSize', 'parent folders tree', 'fileID']
    ]);
    var trig = ScriptApp.newTrigger('getDriveFilesList_').timeBased().everyMinutes(5).create();
    Logger.log(trig.getUniqueId() + '  ' + trig.getHandlerFunction());
    getDriveFilesList_();
}

function getDriveFilesList_() {
    var content = [];
    var startTime = new Date().getTime();
    var sh = SpreadsheetApp.getActiveSheet();
    if (!PropertiesService.getScriptProperties().getProperty('numberOfFiles')) {
        PropertiesService.getScriptProperties().setProperty('numberOfFiles', 0);
    }

    var numberOfFiles = Number(PropertiesService.getScriptProperties().getProperty('numberOfFiles'));
    Logger.log(numberOfFiles);
    var max = numberOfFiles + 10000;
    if (!PropertiesService.getScriptProperties().getProperty('continuationToken')) {
        var files = DriveApp.getFiles();
        // var files = DriveApp.getFolderById('0B3qSFd_____MTFZMDQ').getFiles();// use this line and comment the above if you want to process a single folder
        // use your chozen folder ID of course (available from the browser url , the part after "https://drive.google.com/?authuser=0#folders/")
    } else {
        var files = DriveApp.continueFileIterator(PropertiesService.getScriptProperties().getProperty('continuationToken'))
    }
    while (files.hasNext() && numberOfFiles < (max)) {
        var file = files.next()
        if (file.getSize() > 0) {
            numberOfFiles++;
            var folder = '(shared)';
            if (file.getParents().hasNext()) {
                folder = getTree_(file)
            }
            content.push([file.getName(), file.getSize(), folder, file.getId()])
        }
        if (new Date().getTime() - startTime > 250000) {
            break
        };
    }
    sh.getRange(sh.getLastRow() + 1, 1, content.length, content[0].length).setValues(content);
    if (!files.hasNext()) {
        ScriptApp.deleteTrigger(ScriptApp.getProjectTriggers()[0]);
        Logger.log('done !');
        sh.getRange(sh.getLastRow() + 1, 1).setValue('All files processed (' + numberOfFiles + ' found)')
    };
    var continuationToken = files.getContinuationToken()
    PropertiesService.getScriptProperties().setProperty('numberOfFiles', numberOfFiles);
    PropertiesService.getScriptProperties().setProperty('continuationToken', continuationToken);
}

function markDuplicates() {
    handleDuplicates_(false)
}

function trashDuplicates() {
    handleDuplicates_(true)
}

function handleDuplicates_(trash) {
    var sh = SpreadsheetApp.getActiveSheet();
    sh.setFrozenRows(1);
    sh.sort(1);
    var data = sh.getDataRange().getValues()
    var headers = data.shift()
    var lastComment = data.pop();
    var toDelete = [];
    var item = data[0];
    for (var n = 1; n < data.length; n++) {
        if (data[n][0] == item[0] && data[n][1] == item[1]) {
            toDelete.push('delete ' + n);
        }
        item = data[n];
    }
    var marker = sh.getRange(2, 1, data.length, 1).getBackgrounds();
    for (var n in data) {
        if (!trash) {
            marker.push(['#FFF'])
        };
        if (toDelete.indexOf('delete ' + n) > -1 && !trash) {
            marker[n][0] = '#F99';
        }
        if (toDelete.indexOf('delete ' + n) > -1 && trash) {
            if (marker[n][0] == '#ff9999') {
                try {
                    DriveApp.getFileById(data[n][3]).setTrashed(trash);
                    marker[n][0] = '#F33';
                } catch (err) {
                    Logger.log(err)
                }
            } else {
                marker[n][0] = '#FF9';
            }
        }
    }
    sh.getRange(2, 1, marker.length, 1).setBackgrounds(marker);
}

function getTree_(file) {
    var tree = [];
    var folderP = file.getParents()
    while (folderP.hasNext()) {
        var folder = folderP.next();
        folderP = folder.getParents();
        tree.push(folder.getName());
    }
    return tree.reverse().join('/');
}