When you attempt to deploy an ASP.NET Core project to App Service on Linux, you may run into an error during the build process – Object reference not set to an instance of an object. When you try to deploy the project to App Service on Windows, everything works, so where is the issue?
If you have been watching Connect(); or if you read the Azure blog, you should be aware by now, that Azure has recently introduced a pretty cool service called App Service on Linux. It is probably also not going to be a surprise to you if I tell you that it is being powered by Docker. And that is not the only great thing about it – you can also bring your own Docker image into App Service on Linux!