The error message suggests that there is a problem with finding the module com.example.demo3 during the initialization of the Java application.
VM : "--module-path "C:\java\javafx-sdk-20.0.1\lib" --add-modules javafx.controls,javafx.fxml"
the error:
"C:\Program Files\Java\jdk-20\bin\java.exe" --module-path C:\java\javafx-sdk-20.0.1\lib --add-modules javafx.controls,javafx.fxml "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2023.1.2\lib\idea_rt.jar=53786:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2023.1.2\bin" -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath "C:\Users\SUNLIGHT COMPUTER.m2\repository\org\openjfx\javafx-controls\20\javafx-controls-20.jar;C:\Users\SUNLIGHT COMPUTER.m2\repository\org\openjfx\javafx-graphics\20\javafx-graphics-20.jar;C:\Users\SUNLIGHT COMPUTER.m2\repository\org\openjfx\javafx-base\20\javafx-base-20.jar;C:\Users\SUNLIGHT COMPUTER.m2\repository\org\openjfx\javafx-fxml\20\javafx-fxml-20.jar" -m com.example.demo3/com.example.demo3.HelloApplication Error occurred during initialization of boot layer java.lang.module.FindException: Module com.example.demo3 not found Process finished with exit code 1