japiera Here is the reply from WP Lab Support
I am sorry to hear that, but we don't support ATUM.
We used to support the ATUM plugin but unfortunately, we commented out the code that adds support for these ATUM plugins (for both WP-Lister plugins) because we've gotten reports of fatal errors and ATUM just flat out refuses to work with their users when they mention that they're using WP-Lister and even goes as far as offering refunds to one of their customers.
We are not supporting ATUM because they refuse to work with us when we need to offer support and fixes to work with ATUM.
We tried to do everything we could, and ATUM support would not help.
You are welcome to send over the error to us so we can have a look, but if it is due to an issue on ATUM's side, you will have to reach out to them and see what they say.
What do I do now?????