Error with install sgcWebSockets

[chiffa]

Hello! I try to add sgcWebSocketsLazarus to my IDE. I open sgcWebSocketsLazarus.lpk make Compile - all is good. Then i try install and get a error: lazarus.pp(0,0) Fatal: Can not find unit sgcWebSocketsLazarus used by Lazarus. Check if package sgcWebSocketsLazarus is in the dependencies.

Any one hade something like that? Any one can help? I would be grateful