The front end page appears empty, white.

I want to re-run the application existing under the domain themindfulness.net on treeroots.net. That is why I cloned the application to treeroots.net. I would now use the template echo. I am not able to run Echo on the Multilangugage site treeroots.net. As far as I can estimate, I configured correctly the template Echo as well as the multilingual setttings. The front end page appears empty, white. I need your advice.
Best Regards
Martin