I'm having troubles to use the Activiti Editor with the plugin on Eclipse Oxygen 3.7.1 installed on Ubuntu 17.10 (Artful).
When creating a new diagram this is how it looks when i open it with the Activiti editor 
I tried installing others versions of Eclipse but the same thing happens
Here is a snap of the logs on the IDE

After restarting Eclipse with the same workspace it won't open saying that an error ocurred.
Deleting the project directory will work for opening the IDE again
The logs for the errors are attached.