Can't use BaseController class in Intellij IDEA 14.1.5

Hello,

i followed the "Getting Started with Plugin Development" guide (on confluence.jetbrains.com), to write a server-side plugin for TeamCity 9.1.3. I installed Java 1.8.0_60, TeamCity, Intellij IDEA, maven 3.3.3 and set the environment variables. I followed the instructions step by step, but when i tried to create the controller (Step 4 B) i recognized, that i cant import classes. if i type "import", the automatic prediction shows just "static" as possibility. If i Type "public class AppServer extends BaseController{}" Intellij IDEA says: "cannot resolve symbol 'BaseController'".
Did anyone knows, where my problem is and how can i fix it?

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Original message URL: https://devnet.jetbrains.com/message/5561037#5561037