Error while opening file during update: /etc/openhab2/rules/TESTING.rules - But there is no file: "TESTING.rules"

Hi,
I red the artikel:

First I tried to uninstall zram using option 38 as discript in the doc.
I got the error:
│ There was an error or interruption during the execution of: │
│ “30 | System Settings” │
│ │
│ Please try again. If the error persists, please read │
│ /opt/openhabian/docs/openhabian-DEBUG.md or │
https://github.com/openhab/openhabian/blob/master/docs/openhabian-DEBUG.md
│ how to proceed. │

Now I´m confused and the “…openhabian-DEBUG.md” is in my eyes - sorry for that - not easy understandable. Better the github doc about that.

BUT in the docs above they talk abaout /etc/zram as configuration place. This path is not in my system.

As I say before: Using openhab2-2.5.8-1 there are no errors on exactly the same openhabian basic system.
In my eyes, if the error is couse by the use of zram, it must be there in both software levels.
Or is ZRAM using are forced with the new 2.5.10-1 level?

Thanks Stef