@TotallyInformation maybe this problem is related to what i noticed also when i used version 4 and we briefly discussed in this thread
uibuilderfe.js Module not found: Can't resolve 'socket.io-client'
could this be solved if uibuilder included socket.io-client in its dependencies ?
in my case I had to run npm install socket.io-client in node-red-contrib-uibuilder folder.
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