This is extremely bad. This "apps" provided by 1and1 are completely useless for developers. I remember trying back in 2008 to install Joomla. I couldn't modify anything. I contacted 1and1 support and they told me that it wasn't possible. They advise me to install it manually, and then the technical support specialist added: "We already inform our admin team on this issue and they are working on it, however we don't have a time frame when it can be fixed and updated". So 5 years went by and the same issue is present on all "Click-n-Build" apps. I am seriously thinking about moving all of my domains to a new server.