C:\Users\root\Desktop>java -jar enigma-swing-2.1.0.jar Error: Unable to initialize main class cuchaz.enigma.gui.Main Caused by: java.lang.NoClassDefFoundError: joptsimple/OptionException I try run ...

I used the setup tool to make a desktop-only application and imported it into Eclipse by importing a Gradle project. When trying to run the DesktopLauncher main class I get the following error: Error: ...

It typically means that the Java compiler cannot find the main class of your program, causing it to fail to execute. In other words, it’s having trouble locating and executing the primary class that ...