Post action not working in controller but working in another controller

I have a project that allows users to create a new project. The UI has some textboxes and a submit button. It sends data through a POST request to an api call, which then creates a new project entity in the database. I deleted my migrations and then added a new migration since I wanted to fix some code, but now the post action no longer works. I see the following error message in the console –

How can I insert the current logged in user in a database using ASP.NET Core

I am trying to insert the current logged in user in a database. I had an idea of making a hidden input text field in the view, taking its value, and inputting it in the database using the asp-for. But it doesn’t seem to work. Can you please tell me what am I doing wrong and if you have any other suggestion on how to fix this in any other way, feel free to tell me.
Thank you in advance <3
This is the view code (P.S I took out some code of the view, I feel as though it is unnecessary for the questions purpose):

IIS end application on every request

I’ve notice that on the production server, my asp.net 4.7.2 application is very slow. By debugging I’ve found that in global.asax the Application_start and Application_end is called on every request, causing a recompile of the application each time and slowing down the response.
I0ve test it on several servers and the behaviour is always the same.
Running the website on localhost in IIS (not iis express) this not happen.
How can I check why Application_End is called and from where?
Debugging in VS the Application_end stacktrace is empty, I cannot see from where is called.

CKEditor – Error Decoding Failed – Not loading editor

I have been using CKEditor for a bit on an older project. I just loaded it up in Visual Studio and noticed there is an issue loading the scripts. It appears when it loads, I get a DECODED_FAILED error in the console. Screenshots below… any thoughts as to why this would be different? VS has the latest updates and this is an ASP.Net MVC project.