branch doesn't build

I'm getting the following error in a mvn build of the branch:

[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
/home/frnk/Hippo/hippo-ecm-2_02_xx/addon/cms/admin/src/main/java/org/hippoecm/frontend/plugins/cms/admin/groups/ListGroupsPanel.java:[74,43] cannot find symbol
symbol: class ViewGroupPanel
return new ViewGroupPanel(componentId, context, breadCrumbModel, model);

/home/frnk/Hippo/hippo-ecm-2_02_xx/addon/cms/admin/src/main/java/org/hippoecm/frontend/plugins/cms/admin/groups/ListGroupsPanel.java:[74,43] cannot find symbol
symbol: class ViewGroupPanel
return new ViewGroupPanel(componentId, context, breadCrumbModel, model);