java.lang.RuntimeException: Already connected

Hi, I can’t understand why java.lang.RuntimeException: Already connected at org.thethingsnetwork.data.mqtt.Client.onError(Client.java:406) ~[data-mqtt-2.1.3.jar:na]
Doing everything as in “quick start” https://www.thethingsnetwork.org/docs/applications/java/quick-start/
Can you tell me what I’m doing wrong? Example of my code https://prnt.sc/22sf0z7