Zekr error

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/swt/SWT
    at net.sf.zekr.common.config.GlobalConfig.<clinit>(GlobalConfig.java:34)
    at net.sf.zekr.common.runtime.Naming.<clinit>(Naming.java:21)
    at net.sf.zekr.engine.log.Logger.<clinit>(Logger.java:44)
    at net.sf.zekr.ZekrMain.<clinit>(ZekrMain.java:32)
Caused by: java.lang.ClassNotFoundException: org.eclipse.swt.SWT
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    ... 4 more
Could not find the main class: net.sf.zekr.ZekrMain. Program will exit