I am trying to run WebVOWL local and i used the Development setup guide (step 1-6) because i want to make some modifications.

The ontologies that already exist (FOAF, etc.) work well. But when I load my own ontology I have to use O2V where I get an error.

I get the following message in the menu bar:
Retrieving ontology from file: 01.rdf
Could not establish connection to OWL2VOWL service
Trying to convert with other communication protocol.

Error: GET http://192.168.2.73:3000/serverTimeStamp 404 (Not Found)

This is the part from the error message:
responseURL: "http://192.168.2.73:3000/serverTimeStamp"
responseXML: null
status: 404
statusText: "Not Found"

As I said, I only performed the 6 steps of the guide and did nothing else with O2V. Is that necessary? If so how can I implement this?