"Old" app entitys seems not to work anymore

After a recent update of a live app environment, the app seems not to work properly anymore at existing entitys. If I rebuild a project, the application works fine, but the existing entity gives an error msg. Is it possible to receive a printout of the live app error msgs, in order to specify why the error occurs?
Many thanks!

Hi Bart,

We are working on a solution to view the error logs in production, in the meantime we will need to try and reproduce the error in development. I will DM you.