BuildMode
From WCell Wiki
Make sure you use the right buildmode for compiling WCell. The buildmode should be chosen based on your purpose: if you want to run a public server, choose release. When you are a developer or want to help developing, use debug. When an error occurs, the current player gets disconnected, and there are much bugs. Also in debug mode, when an exception occurs, a detailed message about what went wrong appears in the console.