iisexpress crashing not able to debug

I am trying to debug my asp.net , which calls a api (which is a 3rd party wrapper). On calling the below method it crashes.

private void RegisterCallbacks()
        {
            _instance.Callbacks.RegisterCallbacks(LogCallback, StatusCallback, BusyCallback, ExceptionCallback);
        }

Here _instance is of that API. It crashes IIS and no error.. Any ideas what could be wrong?

Getting below in eventvwr

Faulting application name: iisexpress.exe, version: 10.0.14358.1000, time stamp: 0x574fc56b Faulting module name: HybirRelease32.dll, version: 0.0.0.0, time stamp: 0x597ec186 Exception code: 0xc00000fd Fault offset: 0x001cffe7 Faulting process id: 0x814 Faulting application start time: 0x01d315fa7acca3f0 Faulting application path: C:\Program Files (x86)\IIS Express\iisexpress.exe Faulting module path: C:\Test\xxx.dll Report Id: 32057b9d-8f56-45c9-abc6-64771c99c4ba Faulting package full name: Faulting package-relative application ID:

Publish the hosted application as debug mode, then go to visual studio debug-> Attach to process -> w3wp.exe(find in 'user name' column your hosted name) select and attach. you can debug the application in IIS host