When launching DigEplan with the url; http://yourservername:8088/av_con you receive the message seen below:
Please ensure that the AutoVue Glassfish Service is started on your DigEplan server.
Link here: How to Start AutoVue Glassfish Service
This should have resolved your issue :)
However, If this does not solve the issue, please get in contact with our support team at www.support.lifecycle-tech.com