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I uploaded a picture for a room. Unfortunately I can no longer see this picture. In the room the picture only appears as "img" with a broken symbol. If I want to delete this "uploaded" image, I get the message SmartHome UI - ERROR ...

I am no longer able to upload a new picture.

On my z-wave gateway I have created three three user. But no user appears in the user administration. I can't create them on a second time because they already exist. Therefore I cannot delete or change them. How can I solve the problem?
Best regards
Udo