Android CAR - Custom element don't exist

Tags: #<Tag:0x00007f73ae079c88>

HI,
I’m running into a really strange problem.
For more than a year now I have been working on the lovelace interface without too many problems.
I have several ISO & android devices (even old ones) that work perfectly.

Now I wanted to install the native app on my android car stereo with Android9 installed.
but surprise: all custom components are not loaded and show the classic red box with the error “element not found”.

Has anyone ever happened?

many thanks
Lorenzo