Do the following:
- Login to system as admin;
- Create in root page PageA;
- Go to PageA and create page PageA;
- Save;
- When you situated on PageAPageA, click ?More? | ?Move page?;
- Select root directory;
- Confirm your action;
In result I have received message ?Sorry, but there was an internal problem ? please try again soon?. This is incorrect message. More correct to print other more user-friendly message like ?DEKI cannot move this page, because target directory already contain page with same name? or etc.
See screenshot for more info.
DmitryA