Using Mendix Business Modeler with Java1.7.0_10 in offline mode as i am behind proxy. running a simple application with no compilation error. but getting below error . Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/spi/LoggerFactoryBinder at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$000(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at com.mendix.m2ee.server.AppContainer.<init>(AppContainer.java:59) at com.mendix.m2ee.server.HttpAdminAppContainer.<init>(HttpAdminAppContainer.java:24) at com.mendix.m2ee.server.HttpAdminAppContainer.main(HttpAdminAppContainer.java:19) Please help me.