Custom Visual 3D Bar Chart not displaying

Hi guys

I am trying to get a 3D Bar Chart from github up and running (https://github.com/zBritva/3DBarChart). I installed all the dependencies, the visual is compiling without errors but only an empty developer visual is displayed in Power BI service like so: 

I've already opened an issue on GitHub but no response there. Does anyone have an idea what could be going wrong? 

The visual should be fully functionning.

Here's the OneDrive Folder of the whole project: 

https://corpsoft1-my.sharepoint.com/:f:/g/personal/julia_moser_corporatesoftware_ch/EndZJSFnaZ1AmSehsm47UsUBiUq0v9dKdKcurh0deff08A?e=2k3qiK

Thank you!