Removed: Rule 3, Rule 4.
You would need to provide code or more context, perhaps particularly your AJAX calls. If this is a general platform (IIS) and JavaScript issue and generally unrelated to C#, perhaps r/dotnet, r/javascript, or r/webdev would be helpful subreddits to check out.
Pls can you kindly post a screenshot of the error you are getting
C# devs
null reference exceptions