In your tutorial for developing a Cockpit-Plugin there is a wrong path at chapter "Integration into Cockpit". http://docs.camunda.org/latest/real-life/how-to/#cockpit-how-to-develop-a-cockpit-plugin
You say that the Cockpit is available under http://localhost:8080/camunda/app/cockpit. Because of the project name "camunda-webapp" at the camunda-bpm-plattform, the war file is named as the project name. So the user has to rename the deployed package first to "camunda".
Only after this the path is correct.
Maybe its helpful to tell this in your tutorial.