Cannot find the startup method defined in Default.json.

Hello,
There are a couple of things that could be causing this issue and it’s hard to say for sure which one without seeing a test case. If none of these work, please upload a simple test case that reproduces the issue and I’ll have a look.
Try these things:
1. It could be a clean/rebuild issue, caused by renaming the project or changing the namespace. To fix it, delete the bin and obj folders, then rebuild.
2. Verify that Program.cs looks like this:
namespace SeaPass
{
static class Program
{
[STAThread]
static void Main()
{
Application.MainPage = new MainPage();
}
}
}
3. Open the .csproj file and confirm that the AssemblyName is SeaPass.
4. Verify that your default.json looks like this:
{
"url": "Default.html",
"startup": "SeaPass.Program.Main, SeaPass"
}
5. It could be an IIS issue, might be loading an old DLL. Try this: Stop app pool, deploy, delete old files, start app pool again
Hope this helps,
Julie