Items no longer editable after update from 3.2 to 3.3

edited May 2020 in Developers

Hi, I followed these instructions to upgrade my installation from 3.2 to 3.3. Almost everything worked fine. But unfortunately I can't edit my items now, everything else works.

The preview works. But as soon as I click on "compose" I get an internal server error:

500: Property ( ns#value ) of resource ( ) has more than one value do not use getUniquePropertyValue but use getPropertyValue instead

Even when creating a new item I get this error.

Obviously it has something to do with the data language. However, I lack any idea what I can do now. Can anyone help me with that?

Greetings, Stephan

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