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java.lang.Error: can't load javax.swing.plaf.metal.MetalLookAndFeel at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1326) at javax.swing.UIManager.initialize(UIManager.java:1407) at javax.swing.UIManager.maybeInitialize(UIManager.java:1395) at javax.swing.UIManager.getDefaults(UIManager.java:644) at javax.swing.UIManager.getColor(UIManager.java:686) at org.jfree.chart.JFreeChart.<clinit>(JFreeChart.java:261) at org.jfree.chart.ChartFactory.createLineChart3D(ChartFactory.java:1296) at org.adempiere.apps.graph.GraphBuilder.createLineChart(GraphBuilder.java:170) at org.adempiere.apps.graph.GraphBuilder.createChart(GraphBuilder.java:75) at org.adempiere.webui.apps.graph.WGraph.render(WGraph.java:215) at org.adempiere.webui.apps.graph.WGraph.<init>(WGraph.java:153)