I'm having trouble getting a POST request to a controller action in an MVC widget to function. Running the project in debug allows me to see that the code in the action, and then in the view, is all run perfectly fine without any problem. But some time after the view finishes being run, Sitefinity returns a 404 instead of the view. Can anyone help with this? It's very urgent that we get this fixed and these kinds of issues seem to be constantly popping up with Sitefinity.
The problem is that the error is occurring after my code has already run, so I have no idea WHERE the real problem is. There is no exception details or anything of the sort, so I have no clue where to even begin.
That said, when in Debug mode, after the view is rendered Visual Studio is asking me for the location of a file called "OpenAccessDataProvider_82b1799c64a76a459b11ff0000693a07.ascx"
What does this mean, am I missing a file somehow?
(I'm using Sitefinity v8.2)
Edit: Oh, and probably worth mentioning that the error occurs regardless of what I put in the action or the view, an empty action returning an empty view still produces this error.
See attached image for the 404 screen I'm seeing.