Creating a new section: "space id: this field cannot hold more than 1 values."

I let generate a new cloud server with the open atrium appliation by bitnami.
I logged on at the server with "user" and the password generated by bitnami.
I got the page "Welcome user to atrium" and clicked on "create content".
I got the page "Site home".
I clicked on "+ New Space".
I filled out the fields of the form and clicked "publish".
I got the page "Site Home" with my new space.
I clicked on my new space.
I got the page "Site home" with the buttons "New Section" and "New Subspace".
I clicked on "New Section" and filled out the fields.
I clicked on "Publish" and got the error message:
space id: this field cannot hold more than 1 values.
I have no idea whats wrong. Do I forgot something?

Any ideas?