thank you. that was very helpful.
We have some content in an event content type. The error the OP references is in red, and it is not clear if it finished configuring or what the next step is. It also doesn't say what to do with the existing content type in terms of documentation. (The migrated content type does use smart date and was configured using a similar module in a previous version.)
In my view, this is a bug and should be fixed or this error message needs to be much better and reference a known issue with a hyperlink. Changing the name would be easy and not conflict with date tools in d6 and d7. Thanks for all of this work.
To reproduce:
use composer require calender starter kit. The starter kit is a requirement. (therefore preventing successful installation of any of the modules.) The error appears in red with no notion that it is because the maintainer won't rename the content type. it just looks like it failed.