I am using the package "node-red-contrib-iiot-opcua".
The problem is that when I try to deploy a flow I get the problem that you can see in the following screenshot. I don't know how to fix it.
The flow is working on a Raspberry with Raspbian GNU/Linux 9 (stretch). My Node-RED version is "0.20.0" and mi Node version is 10.5.3.