ERROR: Fehler Unable to write entry Es kann kein Installationspaket gefunden werden! What's to do?

Fehler Unable to write entry Es kann kein Installationspaket gefunden werden! Yesterday in v.322 everything ok, upload to joomla works. Today themler will be updates to v.337 and now i could not...

Please, take a look at www.ganasport.eu: it's as it should be if visited by chrome, not the same if visited by firefox. If modified in firefox by the themler interface, everything is shown...

Updated Joomla site to 3.6.2 Themler loads but I get script errors and then a #HttpErrorTitle200. I cannot edit template, load new templates, or start from...