The page where you can edit a workflow model (add steps, participants and such) is not loading the toolbar with the workflow components.
This is the error I'm getting:
04.02.2016 11:52:08.739 *ERROR* [10.10.118.17 [1454604728735] GET /etc/designs/default.css HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught SlingException org.apache.sling.scripting.java.impl.ServletWrapper$CompilerException: Compilation errors in /apps/wcm/core/components/designer/designer.css.java: Line 13, column 415 : The declared package "libs.wcm.core.components.designer" does not match the expected package "apps.wcm.core.components.designer" at org.apache.sling.scripting.java.impl.ServletWrapper$CompilerException.create(ServletWrapper.java:290) at org.apache.sling.scripting.java.impl.ServletWrapper.compile(ServletWrapper.java:253) at org.apache.sling.scripting.java.impl.ServletWrapper.getServlet(ServletWrapper.java:177) at org.apache.sling.scripting.java.impl.ServletWrapper.service(ServletWrapper.java:116) at org.apache.sling.scripting.java.impl.JavaScriptEngineFactory.callServlet(JavaScriptEngineFactory.java:217) at org.apache.sling.scripting.java.impl.JavaScriptEngineFactory.access$000(JavaScriptEngineFactory.java:73) at org.apache.sling.scripting.java.impl.JavaScriptEngineFactory$JavaScriptEngine.eval(JavaScriptEngineFactory.java:281) at org.apache.sling.scripting.core.impl.DefaultSlingScript.call(DefaultSlingScript.java:361) at org.apache.sling.scripting.core.impl.DefaultSlingScript.eval(DefaultSlingScript.java:171) at org.apache.sling.scripting.core.impl.DefaultSlingScript.service(DefaultSlingScript.java:463) at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:533) at org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:44) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:77) at com.day.cq.personalization.impl.TargetComponentFilter.doFilter(TargetComponentFilter.java:96) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68) at com.day.cq.wcm.core.impl.WCMDebugFilter.doFilter(WCMDebugFilter.java:146) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68) at com.day.cq.wcm.core.impl.WCMComponentFilter.doFilter(WCMComponentFilter.java:230) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68) at com.day.cq.wcm.core.impl.WCMDeveloperModeFilter.doFilter(WCMDeveloperModeFilter.java:117) at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68) at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processComponent(SlingRequestProcessorImpl.java:282) at org.apache.sling.engine.impl.SlingRequestProcessorImpl.dispatchRequest(SlingRequestProcessorImpl.java:322) at org.apache.sling.engine.impl.request.SlingRequestDispatcher.dispatch(SlingRequestDispatcher.java:216)
