Build a panel plugin with D3.js not working

I am trying to create a plugin by following this tutorial and I cannot get past the 4th step
https://grafana.com/tutorials/build-a-panel-plugin-with-d3/#4

When I am trying to load the plugin to my dashboard I am getting this error


Please help…

Okay, finally managed to find out the issue here.
https://github.com/grafana/simple-react-panel/issues/18

React plugin support was patchy in 6.x, hope it works well with Grafana 7.x