Sorry, an unexpected error occured. ***Survey has been inoperable for more than 2 months***.

Hi there, while it sounds like Qualtrics support is best equipped to investigate your specific issue, it's possible that someone in the community could check it out if they are able to reproduce it on their end. To do so, would it be possible to post a QSF of your survey? Or perhaps the code that you have running when the respondent tries to submit the survey, resulting in that error?

adpatter your post mentioned that your survey uses JavaScript. If you don't have any running on page submit for your last question (and you only see the error on survey submission), then it is probably not the cause of the error. Being able to replicate the error in a separate survey should provide some direction.

Tom_1842
We have 4 instances of JavaScript in our newly revised survey (the error in the comment above arose while attempting to complete the revised survey). Each instance is a "type to search" implementation. The code is shown below. The 

data

 is truncated in the below example. This implementation seems to work well - it doesn't throw or produce any errors in the console.
Qualtrics.SurveyEngine.addOnReady(function () {


    class ListItem {
        constructor(data, key) {


            this.mouseLeave = this.mouseLeave.bind(this);
            this.mouseOver = this.mouseOver.bind(this);


            this.data = data;


            this.li = document.createElement('li');
            this.li.textContent = this.data[key];
            this.li.setAttribute('style', 'display: block; cursor:pointer; border:1px solid #ccc; padding: 12px; text-decoration: none; font-size: 18px; background-color: #f8f8f8');
            this.li.addEventListener('mouseover', this.mouseOver);
            this.li.addEventListener('mouseleave', this.mouseLeave);


            this.score = 0;
        }


        mouseOver(event) {
            if (event.target.style.backgroundColor != 'cyan') {
                event.target.style.backgroundColor = '#fff';
            }
        }


        mouseLeave(event) {
            if (event.target.style.backgroundColor != 'cyan') {
                event.target.style.backgroundColor = '#f8f8f8';
            }
        }
    }


    class TypeToSearch {


        constructor(qId, data, key) {
            this.renderListItems = this.renderListItems.bind(this);
            this.clickListItem = this.clickListItem.bind(this);
            this.sortListItems = this.sortListItems.bind(this);
            this.scoreListItems = this.scoreListItems.bind(this);


            this.data = data;
            this.div = document.createElement('div');
            this.qInput = document.querySelector('#' + qId + ' .QuestionBody #QR\\\\~' + qId);
            let questionBody = document.querySelector('#' + qId + ' .QuestionBody');
            let form = document.createElement('form');


            this.input = document.createElement('input');
            this.input.setAttribute('type', 'text');
            this.input.setAttribute('style', 'width: 100%; height: 32px; line-height: 32px;');


            this.ul = document.createElement('ul');
            this.ul.setAttribute('style', 'list-style: none; height: 474.5px; border: 1px solid black; overflow-x: hidden; overflow-y: scroll; padding-left: 0;');


            questionBody.appendChild(this.div);
            this.div.appendChild(form);
            form.appendChild(this.input);
            this.div.appendChild(this.ul);


            this.timeouts = [];


            this.listItems = [];


            for (let datum of this.data) {
                let item = new ListItem(datum, key)
                this.listItems.push(item);
                item.li.addEventListener('click', this.clickListItem, true);
            }


            this.renderListItems();
            this.input.addEventListener('keyup', this.scoreListItems);
        }


        scoreListItems() {
            for (let timeout of this.timeouts) {
                clearTimeout(timeout);
            }


            this.timeouts = [];


            let words = this.input.value.replace(/[^a-z0-9 ]/gi, '').split(/\\s/);
            let patterns = words.map((word) => new RegExp(word.split('').map((letter) => '(' + letter + '[a-z0-9]*?)').join(''), 'igd'));
            let fn = (index) => {
                for (let i = index; i < this.listItems.length; i++) {
                    let item = this.listItems[i];
                    item.score = 0;
                    for (let pattern of patterns) {
                        let matches = [...item.li.textContent.matchAll(pattern)];
                        for (let match of matches) {
                            for (let i = 1; i < match.length; i++) {
                                item.score = item.score + 1 / (match['indices'][i][1] - match['indices'][i][0]);
                            }
                            item.score = item.score / matches.length;
                        }
                    }


                    if (i % 1000 == 0) {
                        this.timeouts.push(setTimeout(fn, 0, ++i));
                        return;
                    }
                }
                this.sortListItems();
            }


            this.timeouts.push(setTimeout(fn, 0, 0));
        }


        sortListItems() {
            this.listItems.sort((a, b) => b.score - a.score);
            this.renderListItems();
        }


        renderListItems() {
            this.ul.innerHTML = '';


            let fn = (index) => {
                for (let i = index; i < this.listItems.length; i++) {
                    let item = this.listItems[i];
                    // item.li.textContent = item.data['soc_title'] + ' ' + item.score;
                    this.ul.appendChild(item.li);


                    if (i % 1000 == 0) {
                        this.timeouts.push(setTimeout(fn, 0, ++i));
                        return;
                    }
                }
            }


            this.timeouts.push(setTimeout(fn, 0, 0));
        }


        clickListItem(event) {
            for (let item of this.listItems) {
                if (event.target == item.li) {
                    item.li.style.backgroundColor = 'cyan';
                    this.qInput.value = this.input.value + ' | ' + Object.values(item.data).join(' | ');
                }
                else {
                    item.li.style.backgroundColor = '#f8f8f8';
                }
            }
        }
    }


    var data = [{ "soc_code": "43-5031", "soc_title": "911 Dispatcher" }, { "soc_code": "43-5031", "soc_title": "911 Operator" }, { "soc_code": "49-3011", "soc_title": "A&P Mechanic" }, { "soc_code": "49-2092", "soc_title": "AC/DC Rewinder" }, { "soc_code": "21-1019", "soc_title": "AIDS Counselor" }, { "soc_code": "21-1022", "soc_title": "AIDS Social Worker" }, { "soc_code": "49-2011", "soc_title": "ATM Servicer" }, { "soc_code": "49-3052", "soc_title": "ATV Technician" }, { "soc_code": "55-1015", "soc_title": "Aadc Plans Staff Officer" }, { "soc_code": "53-5011", "soc_title": "Able Seaman" }, { "soc_code": "17-2041", "soc_title": "Absorption and Adsorption Engineer" }]


    let typeToSearch = new TypeToSearch(this.questionId, data, 'soc_title');
});


Qualtrics.SurveyEngine.addOnUnload(function () {
    /*Place your JavaScript here to run when the page is unloaded*/


});

Tom_1842
You wrote, "If you don't have any running on page submit for your last question (and you only see the error on survey submission), then it is probably not the cause of the error."
Yes, that is correct - the JavaScript does not run on the page where the error arises.

@adpatter -- Did you ever get a resolution to this error message? I am dealing with the same problem for a survey that worked perfectly a year ago (without JavaScript or much complexity otherwise). It throws the error only when trying to exit the survey and record the data, however. I have tried every idea presented in here and created a ticket as well… TIA for any advice!