What's wrong with the wallet? Why not start?

Error: wallet failed to connect to daemon: http://localhost:19744. Daemon either is not started or wrong port was passed
Daemon not started

Haven-wallet-gui - settings - rescan wallet balance.
Try it

Hello everybody! Help me please solve the problem with the error "double tread". I installed the wallet 3.0, it was fully synchronized, I found this error when sending coins. I will be very grateful for any help