Hello guys, I'm Alexey, the cattr product owner.
I'm sorry for the delay with answers in this thread and for all the bugs of the recent cattr version that probably still unfixed.
We working on cattr at a time when we don't have a paid work on other projects (which are a source of funds for developing cattr), but since February all the guys are fully loaded.
As I see, Alex already tried to exclude the most possible reasons for errors but if it does not help, you need to find a programmer who can connect to your server, debug the app and find what's went wrong in your case.
You can also hire us to do this job, contact us via hi@cattr.app or via upwork