When I try to start the game I get the following error message in a red box.

Unable to parse Build/ROB 0.0.7 - Web.framework.js.gz! This can happen if build compression was enabled but web server hosting the content was misconfigured to not serve the file with HTTP Response Header "Content-Encoding: gzip" present. Check browser Console and Devtools Network tab to debug.

I have tried uninstalling and re-installing the game but that didn't help.