Gallery installation fails

Hi there,

I've installed owncloud 10.0.1 on a QNAP-NAS TS469 (latest firmware) with Qapache-Package. It works.
Now I tried to install the Gallery-App (16.0.2) from the marketplace, but it fails. When I click 'Installation...', the icon is circling around for hours. That's all ...

In another post I found a hint to enhance the php memory_limit to 512M. Same problem.

Do you have any ideas? Thanks.