Show weight

[micmicmicmic]

I have changed the weights of edges, I click "Show weight" but nothing appears. Thanks
java.lang.Throwable: Error while loading graphtea.plugins.main.core.actions.RightClickAction. skipped.
at graphtea.ui.xml.UIHandlerImpl.handle_action(Unknown Source)
at graphtea.ui.xml.UIParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at graphtea.ui.xml.UIParser.parse(Unknown Source)
at graphtea.ui.xml.UIParser.parse(Unknown Source)
at graphtea.ui.xml.UIParser.parse(Unknown Source)
at graphtea.ui.UI.loadXML(Unknown Source)
at graphtea.ui.UI.loadXML(Unknown Source)
at graphtea.plugins.main.core.Init.init(Unknown Source)
at graphtea.plugins.main.Init.init(Unknown Source)
at graphtea.platform.plugin.Plugger.load(Unknown Source)
at graphtea.platform.plugin.Plugger.dfs(Unknown Source)
at graphtea.platform.plugin.Plugger.dfs(Unknown Source)
at graphtea.platform.plugin.Plugger.plug(Unknown Source)
at graphtea.platform.Application.loadPlugins(Unknown Source)
at graphtea.platform.Application.run(Unknown Source)
at graphtea.platform.Application.init(Unknown Source)
at graphtea.platform.Application.main(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:65)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:101)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:26)