RCP java.lang.ClassNotFoundException: org.eclipse.swt.widgets.Canvas -


i'm building eclipse rcp application , create accordion menu using nebula pshelf. when running application, error occured following message: !entry org.eclipse.ui.workbench 4 0 2017-08-14 22:42:20.903 !message unable create view id com.y.sopiana.internal.views.menu.toolsviewer: org/eclipse/swt/widgets/canvas !stack 0 java.lang.classnotfoundexception: org.eclipse.swt.widgets.canvas @ org.eclipse.osgi.framework.internal.core.bundleloader.findclassinternal(bundleloader.java:483) @ org.eclipse.osgi.framework.internal.core.bundleloader.findclass(bundleloader.java:399) @ org.eclipse.osgi.framework.internal.core.bundleloader.findclass(bundleloader.java:387) @ org.eclipse.osgi.internal.baseadaptor.defaultclassloader.loadclass(defaultclassloader.java:87) @ java.lang.classloader.loadclass(classloader.java:358) @ java.lang.classloader.defineclass1(native method) @ java.lang.classloader.defineclass(classloader.java:800) @ org.eclipse.osgi.internal.baseadaptor.defaultclassloader.defineclass(defaultclassloader.java:165) @ org.eclipse.osgi.baseadaptor.loader.classpathmanager.defineclass(classpathmanager.java:554) @ org.eclipse.osgi.baseadaptor.loader.classpathmanager.findclassimpl(classpathmanager.java:524) @ org.eclipse.osgi.baseadaptor.loader.classpathmanager.findlocalclassimpl(classpathmanager.java:455) @ org.eclipse.osgi.baseadaptor.loader.classpathmanager.findlocalclass_lockclassloader(classpathmanager.java:443) @ org.eclipse.osgi.baseadaptor.loader.classpathmanager.findlocalclass(classpathmanager.java:423) @ org.eclipse.osgi.internal.baseadaptor.defaultclassloader.findlocalclass(defaultclassloader.java:193) @ org.eclipse.osgi.framework.internal.core.bundleloader.findlocalclass(bundleloader.java:370) @ org.eclipse.osgi.framework.internal.core.singlesourcepackage.loadclass(singlesourcepackage.java:33) @ org.eclipse.osgi.framework.internal.core.bundleloader.findclassinternal(bundleloader.java:443) @ org.eclipse.osgi.framework.internal.core.bundleloader.findclass(bundleloader.java:399) @ org.eclipse.osgi.framework.internal.core.bundleloader.findclass(bundleloader.java:387) @ org.eclipse.osgi.internal.baseadaptor.defaultclassloader.loadclass(defaultclassloader.java:87) @ java.lang.classloader.loadclass(classloader.java:358)


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