Hallo,
ich formuliere zunächst in deutsch:
ich habe mein Projekt erstellt und möchte es in der Sandbox testen aber es kann nicht in die Sandbox installiert werden.

i have created a project 'Galerie'. If I run in sandbox it show the error

Fixed. It was a bug just on your project.
the folder "files" is a symlink and there was a problem there. The component didn't uninstalled well. And the symlink was kept.

It happens sometimes, but so rarely, I still don't understand why.
I will try to force the suppression of this file after uninstalling.

Sorry but the same problem is now.

Fixed manually again.

This is strange. What operation are you doing exactly before it stops to work ?

I go to Projects files and refresh the filelist, than I click to Run on Sandbox.

Fixed.

There was also a problem with images fixed also.