Could not find or load main Class on JAR executing

Question

I finished my project (in NetBeans) and i export Jar file (i set my main class in project properties correctly before exporting Jar):<

Answer 1

Open your jar file with WinRAR or a similar program. Then go to the META-INF folder and open the MANIFEST.MF. Make sure the property "Main-Class: your.class.path" is correct.