:-(
Oops...
It seems that your web browser restricts the access to the file system.
Try to restart the browser with the following command:
chrome.exe -–allow-file-access-from-files
Or visit our deployed website: https://deltamath.asia
Theoretically there should be some insightful words here
But I really don't know how to make it up :)

If you call a support agent, give them this info:

Error: "Access to script from origin 'null' has been blocked by CORS policy"
Have a nice day :)