Hi Simon,
The popup is an alert box generated by the script after it encounters an AJAX parsing error.
If you encounter this error again, take a look at your browser developer tools. and under the 'Network' tab, filter by 'XHR'. This should display the headers sent, and any issues.
Can also check in the 'Console' tab, and see if anything shows up there.
Could be incorrect headers sent, incorrect data-type, or server communication problems.
I've had this problem before many years ago, and never got it resolved (wasn't sure what to look for back then though).
You can stop the alert box from popping up by changing a line of code in /includes/javascript_global.js
To print it to the console instead, try changing this line;
Code: Select all
alert('Error.\nParsing request failed.');
to;
Code: Select all
console.log('Error: Parsing request failed.');
Although the error is annoying, I've never had any actual problems from it before.