I have checked and the Field type > Datetime is not installed, but I did not deactivate or unistall it. I used a routine form somebody else to install Drupal, which is where the problems of not installing Datetime maybe coming from. I have to check that.
After installing Datetime the error does no longer occur.
I don't know if it would make sense to have Datetime as a dependency in Webform.
Thank you very much for your help and time.
I installed a fresh Drupal 9.5.9 and tested with Webform 6.1.5 and Webform 6.2.0-beta6. The error was there.
I installed a fresh Drupal 9.5.9 and tested with Webform 6.1.5 and Webform 6.2.0-beta6. The error was there.
I installed a fresh Drupal 9.5.9 and tested with Webform 6.1.5 and Webform 6.2.0-beta6. The error was there.
I installed a new Drupal 9.5.9 and tested with Webform 6.1.5 and 6.2.0-beta6 and the error was there.