connecting SLOT error -

error slot loginSaat Anda bermain slot on, ada beberapa alasan mengapa akun Anda mungkin terkunci. Salah satunya adalah kesalahan login berulang kali, di mana sistem keamanan situsThis is a first attempt to work with snal slot AFTER I reinstalled my Qt Creator. Since I am adding a slot in device.cpp I do not get why the error is