NoSuchMethodError on Eclipse Mars 4.5M6 on startup

[Jona5]

java.lang.NoSuchMethodError: org.eclipse.e4.ui.css.swt.helpers.CSSSWTColorHelper.getRGB(Lorg/w3c/dom/css/CSSValue;)Lorg/eclipse/swt/graphics/RGB;
    at net.jeeeyul.eclipse.themes.css.internal.handlers.JTabCSSPropertyHandler.applyCSSProperty(JTabCSSPropertyHandler.java:679)
    at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyCSSProperty(AbstractCSSEngine.java:734)
    at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyleDeclaration(AbstractCSSEngine.java:520)
    at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:413)
    at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:354)
    at org.eclipse.e4.ui.css.swt.internal.theme.ThemeEngine.applyStyles(ThemeEngine.java:516)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$6.setClassnameAndId(PartRenderingEngine.java:1282)
    at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.setCSSInfo(SWTPartRenderer.java:113)
    at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.bindWidget(SWTPartRenderer.java:130)

[matthias-fue]

This is a duplicate of #229