Hi,
Since few days I hav a problem with tables.
When I create new table - even with only one column - I cannot save a record:

and info about error during adding new record.
And what next. When I want to remove this table I got info, that table was removed successfully but the tables are still on the list, but without names:

Of course, there is no way to removed them - notification: "Could not find an entity with specified entity logicalname: ........."
I havent made any changes in settings of my enviroment.
There is no problem with existing tables.
Can you help me?