[/VAADIN/widgetsets/com.mycollab.widgetset.MyCollabWidgetSet
09:37:24,103 INFO c.m.s.DefaultServerRunner:57 - Started DefaultServerRunner in 22.082 seconds (JVM running for 23.18)
09:37:31,289 INFO c.v.s.VaadinServlet:772 - Requested resource [/VAADIN/widgetsets/com.mycollab.widgetset.MyCollabWidgetSet/com.mycollab.widgetset.MyCollabWidgetSet.nocache.js] not found from filesystem or through class loader. Add widgetset and/or theme JAR to your classpath or add files to WebContent/VAADIN folder.
09:39:33,522 INFO c.v.s.VaadinServlet:772 - Requested resource [/VAADIN/widgetsets/com.mycollab.widgetset.MyCollabWidgetSet/com.mycollab.widgetset.MyCollabWidgetSet.nocache.js] not found from filesystem or through class loader. Add widgetset and/or theme JAR to your classpath or add files to WebContent/VAADIN folder.
Customer support service by UserEcho
You should go to the sub project mycollab-app-community then run the command mvn compile to let maven vaadin plugin to generate the vaadin assets and run the application again.
Let me know if it doesn't work.